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[zirkkun-uthcs]

Undertale Headcanons

Back to General Headcanons

If you’re looking for a specific character, please use CTRL+F to search for them. Reminder as well that most of this information is entirely headcanon. If there’s canon information that I’ve messed up somewhere on this, please let me know so I can fix it and adjust accordingly!

Frisk (19 yrs old)

Nickname(s): None Height: 5′5″ / 165 cm Gender: non-binary Pronouns: they/them Sexuality: panromantic / demisexual

+ pretty neutral in regards to most things. doesn't even mind that the Player takes control of most of their actions. + will eat literally anything, even if it’s definitely not meant for human consumption. somehow they do not get sick from this. + lost the memory of their life before falling into the Underground.

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Flowey

Nickname(s): None Height: 1′6″ / 46 cm Gender: man Pronouns: he/him Sexuality: aromantic / asexual

+ despite lacking a SOUL, there are still some things he can feel with Determination instead. + his body has not aged physically, otherwise his flower body would have probably died or wilted at this point; instead, it’s given a life force by his monster dust and Determination. + babysits Toriel pretty regularly because of how miserably she treats herself now that her life has fallen apart.

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Toriel

Nickname(s): None Height: 6′8″ / 203 cm Gender: woman Pronouns: she/her Sexuality: demiromantic / heterosexual

+ is stressed. all the time. but just covers it up by doing as many different tasks as possible. + the second she’s not in the presence of children or in a formal situation, she’ll drop swear words like they’re nothing, even with her formal sentence structure. + was only a casual drinker before Chara and Asriel’s deaths, and now she’s become an alcoholic due to her stress.

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Napstablook

Nickname(s): Blooky Height: 3′6″ / 107 cm Gender: non-binary Pronouns: they/them Sexuality: aromantic / asexual

+ they actually are fairly confident with staying in a ghost body for the rest of their life. mostly because they’re too indecisive to pick a corporeal body. + their lack of self-confidence comes from the fact that they lost all of their friends and family, and even when finding out Mettaton was their cousin, they can’t help but feel worthless he never told them about leaving. + doesn’t understand compliments; will react with confusion.

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Sans

Nickname(s): Comic, Tale Height: 4′9″ / 145 cm Gender: demiboy Pronouns: he/him Sexuality: demiromantic / asexual

+ takes a lot of time to like someone at all, usually by default doesn’t trust people. he often diverts from talking about personal things. + is natrually very charismatic, to almost his detriment, really. he doesn’t have many close relationships. + doesn’t interfere with Frisk’s actions in the Underground because he know it won’t make a difference.

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Papyrus

Nickname(s): Pap Height: 6′8″ / 203 cm Gender: non-binary Pronouns: he/him Sexuality: demiromantic / demisexual

+ actually a very talented artist who is always striving to do better, but his hobby is mostly kept to himself. + he doesn’t like greasy food at all... but put any kind of sweet food in front of him, from fruits to marshmallows, and he will eat it so fast-- + likes the quiet despite the fact that he speaks really loud most of the time.

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Undyne

Nickname(s): None Height: 6′10″ / 208 cm Gender: woman Pronouns: she/her Sexuality: homoromantic / homosexual

+ the friend who will make fun of your silly hat but then beat up anyone else who tries to. + likely has a collection of weapons that she named after her favorite anime characters. + is naturally just very strong, she doesn’t even have to work out that often -- and, in fact, is usually pretty laid back when she’s off the clock.

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Mew Mew

Nickname(s): None Height: 5′7″ / 170 cm Gender: woman Pronouns: she/her Sexuality: panromantic / asexual

+ likes a plethora of different kinds of outfits, but finds dresses to be the most comfortable to wear, so she wears them most often + acts a bit like a spoiled brat in many ways; refuses to acknowledge it. + because of the difficulty she has had merging with her Mew Mew body, sometimes she is left in debate if this is actually who she is supposed to be.

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Alphys

Nickname(s): None Height: 3′11″ / 119 cm Gender: woman Pronouns: she/her Sexuality: panromantic / pansexual

+ falls for people really easily and this is to her personal detriment, so she tries to focus it all on fictional characters + notoriously bad at picking out gifts for people, but that doesn’t stop her from buying like forty or so for someone + probably has a very extensive backlog of self-insert fanfiction hidden on her computer that if you find it she will be extremely embarrassed.

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Mettaton

Nickname(s): None Height: (box form) 5′5″ / 165 cm (ex form) 6′2″ / 188 cm Gender: man Pronouns: he/him Sexuality: panromantic / pansexual

+ acts confident to make up for his plethora of self-hatred. + has no physical filter, in a way. doesn’t like swearing, but will not hesitate to destroy whatever is standing next to him to bits if he’s angry. + can often get lost on one thought and lose sight of everything else around him.

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Muffet

Nickname(s): None Height: 3′11″ / 119 cm Gender: woman Pronouns: she/her Sexuality: panromantic / demisexual

+ used to be a ghost, but one day possessed a spider-like doll in order to support the spiders of the Underground. + can make good food out of just about anything – even things that don’t seem edible. + is really friendly when you get to know her, but can seem really abrasive with threatening-sounding jokes.

character tag

Asgore

Nickname(s): None Height: 8′0″ / 244 cm Gender: man Pronouns: he/him Sexuality: polyromantic / polysexual

+ talks to his flowers in the garden as a way of letting go of the stress on his mind. + low-key terrified of echo flowers both because he doesn’t like the idea of the flowers speaking back to him, and he’s scared people will hear the rants he’s told his flowers in the castle when he sees them. + any time he comes across some extra money, he’ll donate it to either someone in need or a charity.

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Asriel

Nickname(s): None Height: 6′0″ / 183 cm Gender: man Pronouns: he/him Sexuality: grey-romantic / asexual

+ tries to make up for what he did as Flowey by doing as many good things as he can, especially for those he wronged. + he, unknowingly, was manipulated by Chara when they were growing up and has retained a plethora of self-guilt as a result. + coping with divorced parents alongside his own, unrepaired trauma from originally losing Chara has left him fairly emotionally weak and he still considers himself as a “crybaby” because of it.

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Chara (19 yrs old)

Nickname(s): None Height: 5′6″ / 168 cm Gender: non-binary Pronouns: they/them Sexuality: aromantic / asexual

+ very determined to get what they want, no matter the costs of it. + does not realize they have manipulative/abusive tendencies and gets frustrated when people try to say they’re either of those things. + was bullied on the Surface and deemed a “monster,” so they adapted to monster culture very easily and wanted to re-invent themself to be more confident.

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W.D. Gaster

Nickname(s): None Height: 6′3″ / 191 cm Gender: man Pronouns: he/him Sexuality: demiromantic / demisexual

+ didn’t actually do anything wrong; died from an unexpected accident during a scientific experiment. + a cheerful guy who likes cracking a lot of jokes more often than not. + ever since the accident he struggles to speak words, so he tends to speak with his hands to try and get the message across.

character tag

#uthcs headcanon #uthcs pin #undertale #undertale headcanon #aged up character //

[zirkkun-uthcs]

Character/UTMV AU list

Rules & Guidelines || Tags Masterlist || General HC Masterlist

Please note that if a character or AU is not on this list, don’t send in asks about them!*

*submissions are fine, though, since the limit is due to my lack of knowledge. May update in the future as I learn more, however.

Additionally, when it comes to AU character’s names in posts themselves, I’ll mark them as AU!Char Name (such as Underswap!Sans) to make it easier for those unfamiliar with AU nicknames to understand while reading headcanons.

Undertale

(19 yr old) Frisk Flowey Toriel Napstablook Sans Papyrus Undyne Mew Mew Alphys Mettaton Muffet Asgore (same age as Flowey) Asriel (19 yr old) Chara W.D. Gaster

Underswap (original concept by p0pcornpr1nce, who has left the fandom and deleted the content)

(19 yr old) Chara Happstablook Asgore Papyrus Sans Alphys Undyne Napstaton Toriel

Underfell (original concept by Vic the Underfella)

(19 yr old) Frisk Toriel Sans Papyrus

Underlust (original concept by nsfwshamecave, who has left the fandom.)

Frisk Toriel Sans Papyrus Mettaton

XTale (by jakei)

Cross XChara XFrisk XPapyrus XGaster

Swapfell (by poptatochisp and community)

Sans  Papyrus

Inktale (+ variants)

Ink (by myebi/comyet) Underverse!Ink (written by jakei) Pale (by unu-nunu-art/unu-nunium) Fresh!Ink (by myebi/comyet)

Errortale (+ variants)

Error (by loverofpiggies/CrayonQueen) Underverse!Error (written by jakei) Template (by unu-nunu-art/unu-nunium)

Dreamtale (by jokublog)

Dream Nightmare

Deltarune

(21 yr old) Kris (23 yr old) Asriel (21 yr old) Susie (21 yr old) Noelle (21 yr old) Berdly (20 yr old) Lancer (23 yr old) Ralsei Roulxs Kaard Jevil Queen Spamton

Underlust Reimagine 

Chara (Arrow) Asgore (Myriad) Toriel (Ash) Gaster (Sage) Alphys (Ally) Sans (Ace) Papyrus (Duo) Grillby (Hugo) Undyne (Pearly) Napstaton Metacrit Muffet (Aqua) Frisk (Tomo)

Swap!Underlust Reimagine

Frisk (Beau) Toriel (Legion) Grillby (Soma) Sans (Amor) Alphys (Rei) Undyne (Duplet) Gaster (Rosemary) Papyrus (Poppy) Mettaton (Metts) Napstereo Loppie Chara (Ami)

swapx4

(swapx4 AU concept) (art of sans & pap) (other char bios)

(19 yr old) Frisk Flowey Napstablook Toriel Sans Papyrus Grillby Undyne Alphys Mettaton Asgore Mew Mew (same age as Flowey) Asriel (19 yr old) Chara

Misc. AU’s

Murder!Sans (by ask-dusttale) Fresh (by loverofpiggies/CrayonQueen)

#uthcs pin

[zirkkun-uthcs]

Rules & Guidelines

Character Masterlist || Tags Masterlist || General HC Masterlist

Please read these before sending in any asks or submissions!! Askbox for requests is currently CLOSED.

General Rules

✨️ No explicit/18+ content. It's not allowed on Tumblr, and I don't wanna get banned so... but suggestive stuff (mature/16+) is free game. ✨️ Younger characters are aged-up! If you're uncomfortable with seeing this content about them regardless, please filter out the tag #aged up character // ✨️ Ship and Char x Reader requests both are allowed. If I'm not comfortable with the ship, I simply won't post it. Romantic, non-reader ships will be tagged with the format #[character 1] x [character 2] for those who want to filter out specific ship tags. ✨️ This blog is LGBTQ+ friendly! This includes headcanons on characters' sexuality, gender, pronouns, or otherwise. ✨️ AU's are welcome here! Please check the character lists to see if I write for someone before sending in an ask. ✨️ No more than 5 characters per ask! If you submit something with more, I'll pick and choose who I want to write for. ✨️ The submission box is for SHARING YOUR headcanons. The ask box is for REQUESTING MY headcanons.

Wills and Won'ts

⭕️ Things I WILL write: character x character, character x reader, polyamorus romantic relationships, familial or platonic relationships, cliche AU's (such as coffee shop or soulmate AU's), tragedies, relationship intimacies (16+), yandere, confessions/first kisses, fluff, angst, preferences/likes and dislikes, healing from trauma, manipulation, and much more. ❌️ Things I WON'T write: pregnancy/having children, generally about children, explicit violence (such as physical abuse, murder, or torture), self-harm or suicide, explicit sexual content, and incest.

Matchup Specific Rules

💕 If you would like characters limited, let me know. By default, I will match you up with anyone off of the list of characters. 💕 Be as descriptive as you would like! Some suggestions include hobbies, habits, values, orientation, and likes/dislikes. 💕 DO NOT INCLUDE PERSONAL INFORMATION! I will delete all asks containing personal info immediately. 💕 Include types of people you are attracted to as well, if you know! It's actually incredibly helpful for matching up parters. 💕 I can do polyamorus matchups as well! If you want more than one matchup, or want to be matched into a polyamorus group, feel free to note this. 💕 Only submit requests when matchups are open! Currently they are CLOSED.

please note that these are subject to change at any time and i have the ability to refuse any request if i'm uncomfortable with its contents.

#uthcs pin #rules #masterpost

[zirkkun-uthcs]

Generic Headcanons (Sanses)

This list includes short bits of information on the various Sanses to be included on this blog. If you’re looking for a specific one, please use CTRL+F to search for the AU, due to the length of this list. Reminder as well that most of this information is entirely headcanon. If there’s canon information that I’ve messed up somewhere on this, please let me know so I can fix it and adjust accordingly!

Please note: When answering asks, I will first list the character being requested in the format of AU!Sans, but the nicknames here are listed because sometimes I drift off while writing and lean towards those names.

Undertale

Nickname/s: Comic, Tale Date of Birth: ??? Height: 4′9″ / 145 cm Gender: demiboy Pronouns: he/him Sexuality: demiromantic / asexual

+ takes a lot of time to like someone at all, usually by default doesn’t trust people + isn’t a fan of physical contact, but if someone was to manage to get close to him, he’s incredibly cuddly + horrible with directions, will get lost really easily; uses shortcuts to make up for it

character tag

Underswap (original concept by p0pcornpr1nce, who has left the fandom and deleted the content)

Nickname/s: Blue Date of Birth: ??? Height: 4′9″ / 145 cm Gender: non-binary Pronouns: he/him Sexuality: demiromantic / bisexual

+ is a pun connoisseur; will only accept the best puns, anything less is just unacceptable + is emotional, but tries to hide it because he feels the need to keep on a strong persona for the sake of everyone else +  is secretly an incredibly talented writer and has a lot of written works in his room

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Underfell (original concept by Vic the Underfella)

Nickname/s: Red, Fell Date of Birth: ??? Height: 4′9″ / 145 cm Gender: cisman Pronouns: he/him Sexuality: panromantic / pansexual

+ is extremely self-conscious and hides this by acting like as much of a confident asshole as possible + crushes incredibly easy due to the lack of caring people he has in his life, but refuses to believe he’s lovable + secretly hates cats. doomfanger may or may not be the cause of this

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Underlust  (original concept by nsfwshamecave, who has left the fandom.)

Nickname/s: Lust, Lusty Date of Birth: ??? Height: 4′9″ / 145 cm Gender: demiboy Pronouns: he/him Sexuality: biromantic / bisexual

+ is secretly a hopeless romantic, but has yet to meet anyone interested in romance over sex, so he takes what he can get + flirts with anything that breathes; has a plethora of horrible pick-up lines + has been outside of his own AU and is well-versed in the multiverse

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Xtale (by jakei)

Nickname/s: Cross Date of Birth: Oct. 10th Height: 4′9″ / 145 cm Gender: cisman Pronouns: he/him Sexuality: demiromantic / bisexual

+ has difficulty trusting anyone anymore due to the betrayal he’s had in the past + he finds comfort in doodling or other art-related things, and can often be found locked away for hours doing so + will wear literally anything but his uniform when no one’s around, no matter how stupid it looks

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Ink (by myebi/comyet) (same headcanons apply to Underverse!Ink)

Nickname/s: None Date of Birth: April 15 Height: 3′9″ / 116 cm Gender: demiboy Pronouns: he/him Sexuality: aromantic / asexual

+ his ink vials’ colors represent: green = comfort/safety, yellow = joy/energy, orange = encouragement/creativity, red = wrath/violence, pink = love/care, purple = lust/attraction, blue = sadness/concern, cyan = calm/relaxed + refuses to ever drink his pink or purple vials anymore due to the fact he doesn’t want to mislead people into thinking he cares about them + his tastes change based on what emotions he’s feeling/ink he’s drank

character tag underverse-specific

Pale (by unu-nunu-art/unu-nunium)

Nickname/s: None Date of Birth: May 26th Height: 3′9″ / 116 cm Gender: cisman Pronouns: he/him Sexuality: aromantic / asexual

+ clings to people who help him literally only once, because he considers all nice gestures as “Oh, so we’re friends now?” + appreciates any and all physical contact and can get a bit nervous if he’s near someone but can’t hug them + when he absorbs an AU for emotions, he has even more emotions that Ink does, but it’s far more temporary

character tag

Fresh!Ink (by myebi/comyet)

Nickname/s: None Date of Birth: ??? Height: 5′0″ / 152 cm Gender: cisman Pronouns: he/him Sexuality: aromantic / asexual

+ is a parasite like Fresh is, but isn’t the same exact one; they exist as separate beings + doesn’t ever really drink ink vials, hence why he’s replaced them with his spray cans entirely, which just contain normal pain + enjoys making large street-art style murals, but never keeps them, so he places them in hugely inconvenient parts of the multiverse just to annoy people

character tag

Error (by loverofpiggies/CrayonQueen) (same headcanons apply to Underverse!Error)

Nickname/s: None Date of Birth: April 4th Height: 5′4″ / 163 cm Gender: cisman Pronouns: he/him Sexuality: demiromantic / demisexual

+ doesn’t trust anyone and would rather just dispose of someone before he gets the chance to even try and trust them + has tried to delete his own emotions on several occasions, but concludes he must lose his SOUL to do so, and is too scared he’ll die + lacks logic due to the fact that he’s a glitch in a program, meaning he can no longer create logical conclusions

character tag underverse-specific

Template (by unu-nunu-art/unu-nunium)

Nickname/s: None Date of Birth: April 3rd Height: 4′5″ / 135 cm Gender: cisman Pronouns: he/him Sexuality: demiromantic / demisexual

+ constantly does a plethora of redeemable, good things within the multiverse to compensate for the fact he’s an “Error” + tries to be more comfortable with things like hugs in order to further distance himself from Error, despite also having haphephobia. + unlike Error, remembers his past as Geno a lot more vividly

character tag

Ragnartale (by NaomyMikolMaria) (please note I’m a bit behind on this AU)

Nickname/s: Knight Date of Birth: ??? Height: 5′5″ / 165 cm Gender: cisman Pronouns: he/him Sexuality: heteroromantic / demisexual

+ doesn’t like using his magic anymore, but can’t exactly remember why it leaves a bad taste in his mouth + actively tries to void out his emotions for others’ sake, as he finds his own life far less valuable + part of him likes being a monster more than a human, because he thinks he looks horrible now and that more people will leave him alone

character tag

Dusttale (by ask-dusttale)

Nickname/s: Dust, Dusty Date of Birth: ??? Height: 4′9″ / 145 cm Gender: demiboy Pronouns: he/him Sexuality: lithromantic / asexual

+ absolutely despises all humans and it wouldn’t be surprising if he tried to kill any on sight + can often be seen talking aloud to “himself,” but he’s actually talking to “Papyrus” + has the same observant skills as Sans and is just as quick on his feet if not faster, however he’s also more rash in his decision-making due to his insanity.

character tag

Fresh (by loverofpiggies/CrayonQueen)

Nickname/s: None Date of Birth: April 20th (pretends it’s April 1st) Height: 6′3″ / 191 cm Gender: genderfluid Pronouns: he/him or they/them Sexuality: aromantic / asexual

+ while he be default doesn’t have any emotions, if for some reason he starts to feel anything, he will reject it immediately, and become incredibly harsh + started dressing in 90′s clothes as a joke, now he enjoys them unironically and has genuinely started watching human 90′s shows + sends memes to Error just to piss him off; his favorite to send is Rick Rolls

character tag

Outertale (by 2mi127)

Nickname/s: Outer Date of Birth: ??? Height: 4′9″ / 145 cm Gender: demiboy Pronouns: he/him Sexuality: demiromantic / asexual

+ because he can see the stars all the time, he’s far more fascinated by the Earth’s sun and atmosphere compared to other Sanses + has had his jacket since he was a kid but just didn’t bother getting rid of it. that and he never outgrew it. sometimes people still think he’s a kid because of it + gets cold easily; his jacket is extremely thick and fuzzy to make up for this

character tag

Altertale (by friisans)

Nickname/s: Guardian Date of Birth: ??? Height: 4′9″ / 145 cm Gender: demiboy Pronouns: he/him Sexuality: biromantic / demisexual

+ despises his brother so much that he won’t even look in his general direction and will likely burn or destroy anything that reminds him of his brother + appears very calm and collected most of the time, but can easily turn around and be manipulative or angry when least expected + is horrible at keeping watch of the human children because he always teaches them how to exploit things and they use that against him

character tag

Aftertale (by loverofpiggies/CrayonQueen)

Nickname/s: Geno Date of Birth: ??? Height: 5′0″ / 152 cm Gender: demiboy Pronouns: he/him Sexuality: demiromantic / demisexual

+ is really bad at social interaction due to extended isolation and because of that may come off as blunt or rude + if anyone acts friendly around him, especially if they are a more physical kind of person, he will instantly not trust them + seeing spaghetti is a sure way to make him burst into tears, but he’ll pretend he’s not actually crying

character tag

Swapfell (by poptatochisp and community)

Nickname/s: Mal Date of Birth: ??? Height: 5′3″ / 160 cm Gender: cisman Pronouns: he/him Sexuality: panromantic / demisexual

+ doesn’t do well with people who disagree with him. this will cause genuine unintended arguments over the smallest things + very formal in most situations possible, but assumes everyone else should be too + is bad at emotions, just, in general. understanding them, having them, everything

character tag

#uthcs headcanon #undertale #undertale headcanon #uthcs pin #sans

[zirkkun-uthcs]

General Info (Act to Flirt Cast)

This list includes short bits of information on the Act to Flirt cast. If you’re looking for a specific one, please use CTRL+F to search for the character, due to the length of this list. Reminder as well that most of this information is only “canon” to my fangame AU Act to Flirt, and I have only written this for the characters as of the latest demo (4.1 as of September 2021), to avoid spoilers.

Please note: Because of the nature of how Act to Flirt is written, all characters will be considered to be panromantic/pansexual, unless otherwise specified.

Gaster

Date of Birth: ??? Height: 6′3″ / 191 cm Gender: cisman Pronouns: he/him

+ watches over the world of Undertale and Deltarune sitting outside of the code itself + gets bored very quickly in a black void by himself, so he’s always interested when something new happens in the games + his SOUL is very vague, almost like it’s fading; or so it seems, by his emotions

character tag

Willo

Date of Birth: May 14th Height: 5′10″ / 178 cm Gender: (as player) any/interpretive (as self) [???] Pronouns: (as player) they/them (as self) [???]

+ mostly acts entirely as a vessel for the player; created by W.D. Gaster + their thoughts are never entirely their own; they hear voices all of the time and, most of the time, just accept that as is + has no SOUL of their own -- just Determination

character tag

Flowey

Date of Birth: May 1st Height: 1′6″ / 46 cm Gender: cisman Pronouns: he/him

+ no longer bothers with Saving and Resetting, due to the fact that he can see the code of the game and it leaves him concerned + has aged mentally, but not physically, otherwise his flower body would have died long ago + after failing to get the six SOULs to work for him through Frisk, he’s decided he’d rather focus on getting seven

character tag

Napstablook

Date of Birth: Aug. 28th Height: 3′6″ / 107 Gender: non-binary Pronouns: they/them

+ lives with Mettaton now, who lives in a major chunk of the highest level of the MTT Resort building + has gained some confidence, thanks to Frisk, but still gets flustered very easily + has extreme inferiority complex when it comes to his work

character tag

Toriel

Date of Birth: May 10th Height: 6′8″ / 203 cm Gender: ciswoman Pronouns: she/her

+ now that seven humans have gone through her, she can only assume the worst: all seven are dead. she feels like she has failed and has little interest in protecting Willo in the same manner + partially relieved to see an adult human; she’s only been around human children for so long, it’s relieving to interact with another adult + doesn’t mind being flirted with, no matter how cheesy

character tag

Sans

Date of Birth: Dec. 14th Height: 4′0″ / 122 cm Gender: demiboy Pronouns: he/him

+ has a not-so-obvious grudge against humans as a whole + had stopped doing things on account of resets, but now that time has passed, he’s trying to do things again, more or less + less familiar with the new string of resets and acts as such

character tag

Papyrus

Date of Birth: April 21st Height: 6′10″ / 208 cm Gender: cisman Pronouns: he/him

+ has been trying out new things on advice of Undyne; designing different kinds of puzzles is one of them, including ones he’d previously thought were not as difficult + has a vague memory of Frisk’s resets, but considers them to be just dreams, since no one else seems to understand what he means when he mentions it + trusts very easily, which ends up being sometimes to his detriment

character tag

Undyne

Date of Birth: Oct. 3rd Height: 6′8″ / 203 cm Gender: ciswoman Pronouns: she/her

+ has calmed down a bit about killing humans ever since Frisk came through, even though she’s still very passionate about finding the final SOUL + tries to vary the different type of foods she teaches Papyrus to make now + acts abrasive, but can and will make friends very quickly, despite her conscious hesitation. she’s just internally very gentle

character tag

Mew Mew

Date of Birth: April 6th Height: 5′7″ / 170 cm Gender: transwoman Pronouns: flexes between he/him, she/her, they/them, and it/its

+ dresses how he wants and just wants to be considered himself despite that + likes being told how great they are and loves to hear compliments about themself + is a bit of a himedere, meaning she’s more of the type to want someone to do things how she wants and to be treated like royalty

character tag

Alphys

Date of Birth: Feb. 1st Height: 3′11″ / 119 cm Gender: ciswoman Pronouns: she/her

+ only one who still talks directly to Asgore since Frisk came through the Underground + stays in hiding just as much as he does, purely for the fact that she’s even more nervous about things than he is + can fall in love really easily and has simultaneously -- for her best record -- had a crush on four different people at once, not including fictional characters

character tag

Mettaton

Date of Birth: Nov. 20th Height: 6′2″ / 188 cm Gender: transman Pronouns: he/him

+ doing his best to improve himself as a person, ever since he met Frisk and realized that he’d been very selfish + acts confident to make up for his plethora of self-hatred + his new body doesn’t have a switch on the back for his boxy form and android/EX form. Now, it’s a switch between his NEO and EX forms.

character tag

Muffet

Date of Birth: March 14th Height: 3′11″ / 119 cm Gender: ciswoman Pronouns: she/her

+ used to be a ghost, but one day possessed a spider-like doll in order to support the spiders of the Underground + is very money-stressed all of the time, so she tries to make quick cash to avoid this + she either hates you or loves you, there’s no in between with her

character tag

Asgore

Date of Birth: Jan. 6th Height: 7′ / 213 cm Gender: cisman Pronouns: he/him

+  talks to his flowers in the garden as a way of letting go of the stress on his mind + has a profound guilt over what he’s done. he can’t bring himself to do what he set out to by absorbing human SOULs even after Frisk’s sacrifice + has chosen to lock himself inside (unknowingly) because he’s too scared to admit his feelings to his people

character tag

Asriel

Date of Birth: May 1st Height: 6′7″ / 201 cm Gender: cisman Pronouns: he/him

+ angrier and angrier about how he was left behind by Frisk, but relieved to see them return in the form of Willo + doesn’t want his world in Undertale to end, despite how much it seems like he does + irrationally emotional, but he’s not as self-conscious or upset about this fact as he used to be

character tag

#uthcs headcanon #uthcs pin #undertale #undertale headcanon #undertale act to flirt

[zirkkun-uthcs]

General Headcanons (Deltarune)

If you’re looking for a specific character, please use CTRL+F to search for them. Reminder as well that most of this information is entirely headcanon. If there’s canon information that I’ve messed up somewhere on this, please let me know so I can fix it and adjust accordingly!

Please note: All the characters here depicted as adults and as such they will act differently from the original canon. This is kind of like a college AU for the whole scenario. Additionally, this information is based solely off of Chapter 1 and 2 of Deltarune.

Kris 

Height: 5′9″ / 175 cm Gender: non-binary Pronouns: they/them Sexuality: biromantic / grey-sexual

+ going to the same college as Asriel is, mostly because they didn’t care enough to look elsewhere. + does the minimal amount of work necessary to pass and spends the rest of their time messing around and playing games. + has a strong affinity for sweets, especially chocolate. will devour it in a concerningly short amount of time.

character tag

Asriel

Height: 6′0″ / 183 cm Gender: man Pronouns: he/him Sexuality: grey-romantic / asexual

+ a very good student in university who’s the type that does a lot of other things outside of classes (school activities, charity work, etc.) + is notoriously terrible at video games, but still likes them because they’re mind-numbing. adores games like Stardew Valley and Animal Crossing. + feels very awkward about the fact that he’s been asked out a lot in his life but turned down every offer.

character tag

Susie

Height: 5′9″ / 175 cm Gender: demigirl Pronouns: she/her Sexuality: biromantic / bisexual

+ wasn’t going to go to college, but also wasn’t just about to leave Kris to live on their own during college. + ever since being to the Dark World, Susie started being less aggressive to others to protect herself, and instead is more aggressive to protect others. + can’t hold a job ever because she’s too straightforward. would lie to a customer’s face and say “I’m the manager” when she definitely is not.

character tag

Noelle

Height: 5′5″ / 165 cm Gender: woman Pronouns: she/her Sexuality: panromantic / homosexual

+ got into one of the most prestigious, expensive universities by merit and with a full scholarship. + keeps in contact with Kris and Susie through playing online games with them. she, Kris, Susie, and Berdly all have a Minecraft server together. + has debated on joining some kind of gaming club on campus but is too afraid to open up to strangers about her hobbies.

character tag

Berdly

Height: 5′6″ / 168 cm Gender: man Pronouns: he/him Sexuality: quoiromantic / lithsexual

+ tried to go to the same prestigious university as Noelle, but didn’t manage to get accepted. instead, he goes to the same one as Kris, Susie, and Asriel, since it’s what his family could afford. + definitely trying too hard to be close to Kris and Susie since he has difficulty making friends. they go to the gaming club together once a week. + the kid who grew up a genius protege but then when he got to college he realizes just how not actually smart he was.

character tag

Lancer

Height: 5′0″ /  152 cm Gender: man Pronouns: he/him Sexuality: aromantic / asexual

+ Susie let him use her phone once purely for games and now he constantly asks to borrow it to play games. refuses to get his own phone. + loves trying new things and gets very excited at the prospect of something different, even if it ends up being something he doesn’t like. + really wants a leather jacket to go with his fire bicycle.

character tag

Ralsei

Height: 5′8″ / 172 cm Gender: man Pronouns: he/him Sexuality: grey-romantic / asexual

+ hates light tremendously which is why he has a hat large enough to make his entire face shadowed. + doesn’t switch between black and white fur, the black fur is just what his face looked like under shadow; however he does have splotches of black fur on his body. + his glasses are not the right prescription but in waiting for the Lightners he never got the chance to replace them.

character tag

Rouxls Kaard

Height: 6′5″ / 196 cm Gender: man Pronouns: he/him Sexuality: biromantic / bisexual

+ is actually really bad at puzzles which is why he started making really simple ones to try and throw people off -- so simple it’s difficult, right? + Roulxs Kaard is a name he picked for himself because he found it to be more fitting. + although he seems irresponsible, he’s actually been a great (lesser) father to Lancer.

character tag

Jevil

Height: 4′5″ / 135 cm Gender: genderfluid Pronouns: any, typically leans towards he/him or they/them Sexuality: aromantic / pansexual

+ the way he speaks and thinks sounds very convoluted and twisted to most people, but it makes perfect sense to him. + genuinely cannot sleep ever, always has to be moving + they would sell Spamton to Satan for one corn chip, no questions asked.

character tag

Queen

Height: 6′2″ / 188 cm Gender: woman Pronouns: she/her Sexuality: aromantic / asexual

+ someone showed her Reddit once and she won’t leave the meme subreddits, send help + does a lot of new things with Lancer because she likes hanging out with her son who she adopted just because she could + tries to help Ralsei around Castletown but she’s bad at not just giving orders

character tag

#uthcs headcanon #uthcs pin #undertale #deltarune #undertale headcanon #deltarune headcanon #aged up character //

[zirkkun-uthcs]

General Headcanons Masterlist

Character Masterlist || Rules & Guidelines || Tags Masterlist

List based on Character - OLD AND CURRENTLY BEING RENOVATED

All Sanses

All Papyruses

All Frisks 

All Charas 

All Gasters

All Mettatons

All Toriels

Remaining characters 

List based on AU’s

Undertale Cast

Deltarune Cast 

Underlust Reimagine Cast

Swap!Underlust Reimagine Cast

swapx4 Cast

#uthcs pin

[zirkkun-uthcs]

Generic Headcanons (Papyruses)

This list includes short bits of information on the various Papyruses to be included on this blog. If you’re looking for a specific one, please use CTRL+F to search for the AU, due to the length of this list. Reminder as well that most of this information is entirely headcanon. If there’s canon information that I’ve messed up somewhere on this, please let me know so I can fix it and adjust accordingly!

Please note: When answering asks, I will first list the character being requested in the format of AU!Papyrus, but the nicknames here are listed because sometimes I drift off while writing and lean towards those names.

Undertale

Nickname/s: Pap Date of Birth: ??? Height: 6′8″ / 203 cm Gender: non-binary Pronouns: he/him Sexuality: demiromantic / demisexual

+ is a people-pleaser to the point where he’s not even entirely sure what makes up his own personality; will just answer such questions with “I’M JUST GREAT, OBVIOUSLY.” + has a vague memory of Frisk’s resets, but considers them to be just dreams, since no one else seems to understand what he means when he mentions it + likes the quiet despite the fact that he speaks really loud most of the time

character tag

Underswap (original concept by p0pcornpr1nce, who has left the fandom and deleted the content)

Nickname/s: Swapap Date of Birth: ??? Height: 6′8″ / 203 cm Gender: demiboy Pronouns: he/him Sexuality: demiromantic / bisexual

+ hates having candies with multiple colors (m&m’s, skittles, etc) being mixed up; must separate them before he can eat them + tries not to smoke inside because he knows it bothers other people; when at home, he’ll stand outside on the balcony to keep the smell out of the house + is like a husky in the sense that he will act like a tiny lap dog but is way too huge for this. but he doesn’t care

character tag

Underfell (original concept by Vic the Underfella)

Nickname/s: Edge, Fellpap Date of Birth: ??? Height: 6′8″ / 203 cm Gender: cisman Pronouns: he/him Sexuality: biromantic / bisexual

+ despite the horrific aura he presents, he will do anything in his power to not kill someone if he can avoid it, and never attacks first + has a collection of drawings for outfit designs to replace his current one, but is convinced nothing can look quite as terrifying + has actually tried his own cooking before and know it needs desperate improvement, but will never say that to someone else

character tag

Underlust (original concept by nsfwshamecave, who has left the fandom.)

Nickname/s: Charm Date of Birth: ??? Height: 6′8″ / 203 cm Gender: non-binary Pronouns: he/him Sexuality: panromantic / pansexual

+ doesn’t like flirting and thinks it’s tacky; would rather have a genuine conversation + likes listening to soft jazz music in his free time, as it’s one of the only things that can clear his mind + believes that everyone has the capability to love, rather than just be filled with lust

character tag

XTale (by jakei)

Nickname/s: XPap Date of Birth: Sept. 9th Height: 6′8″ / 203 cm Gender: cisman Pronouns: he/him Sexuality: biromantic / demisexual

+ doesn’t want to hate his brother, but Cross keeps giving him reasons to hate him + has gradually started practicing cooking way less over time, feeling less confident in his cooking abilities + always intends to be the mediator of a conflict, no matter what, but sometimes gets careless with his feelings and strength

character tag

Outertale (by 2mi127)

Nickname/s: Pluto Date of Birth: ??? Height: 6′8″ / 203 cm Gender: non-binary Pronouns: he/him Sexuality: demiromantic / demisexual

+ has a great admiration for the stars and constellations, but more or less just because he thinks they’re neat + taught himself how to design and make his own clothes... partially because he’s annoyed his brother has had the same jacket for years + designed his scarf based off of Mettaton’s cape

character tag

Swapfell (by poptatochisp and community)

Nickname/s: Rus Date of Birth: ??? Height: 6′8″ / 203 cm Gender: demiboy Pronouns: he/him or they/them Sexuality: grey-romantic / bisexual

+ his gold teeth are totally fake. they’re supposed to make him look more threatening + only smokes when he’s really stressed. ...he smokes all the time? ...oh + is genuinely a bit terrified of his brother

character tag

#uthcs headcanon #uthcs pin #undertale #undertale headcanon #papyrus

[zirkkun-uthcs]

Current Tag List

Character Masterlist || Rules & Guidelines || General HC Masterlist

The overall, general tags will be:

#uthcs headcanon #uthcs pin #uthcs reblog #undertale headcanon #undertale #submission #zircon answers (default ask tag) #ask game (for those posts like “send me X to hear about this!”) #not a headcanon #list answer (for a lot of characters listed for a prompt that doesn’t require much writing)

Based on the AU, type of ask/submission, I’ll use these:

#undertale au #deltarune #underswap #underfell #underlust #xtale #errortale #inktale #dusttale #underfresh #outertale #underlust reimagine #swapx4 #swap!underlust reimagine

#[INSERT AU NAME] headcanon

For ships, the tags will be formatted like:

#undertale x reader #[INSERT AU NAME] x reader

#[CHARACTER1] x [CHARACTER2]

It would be too long to list all of the character tags, but for the most part, I’ll follow this format:

#[INSERT AU NAME] ! [CHAR NAME] (example: #underfell!sans)

Exceptions to this rule include: #error #ink #fresh #fresh!ink #template #pale

Characters that will have both kinds of tags: #cross / #xtale!sans #geno / #aftertale!sans

For list answers about collective groups, we’ll just have #all [INSERT CHARACTER NAME] or #all [INSERT AU NAME] cast.

As of right now, we’ll be tagging the following triggers, so please blacklist them if you have one of these. (Additionally, if you need something else tagged, please let me know!)

#blood mention // #death mention // #past abuse // #past trauma // #yandere // #yandere mention // #dark themes // #aged up character //

#uthcs pin

[zirkkun-uthcs]

Generic Headcanons (Frisks)

This list includes short bits of information on the various Frisks to be included on this blog. If you’re looking for a specific one, please use CTRL+F to search for the AU, due to the length of this list. Reminder as well that most of this information is entirely headcanon. If there’s canon information that I’ve messed up somewhere on this, please let me know so I can fix it and adjust accordingly!

Please note: When answering asks, I will first list the character being requested in the format of AU!Frisk, but the nicknames here are listed because sometimes I drift off while writing and lean towards those names. Additionally, Frisk in every AU here is depicted as an adult, whether it be the canon for the AU or my age-up depiction of them. In the cases where they are aged up, they will act differently from the original canon.

Undertale

Nickname/s: None Date of Birth: ??? Height: 5′5″ / 165 cm Gender: non-binary Pronouns: they/them Sexuality: panromantic / demisexual

+ memories of the Underground are vague at best, but they remember all the friends they made as well as the trust they have for them all. + without Player assistance, they cannot save or reset on their own. + is a glutton and will eat literally anything, even if it’s definitely not meant for human consumption. it is not uncommon for them to chew on a pencil when hungry

character tag

Underfell (original concept by Vic the Underfella)

Nickname/s: Fellisk Date of Birth: ??? Height: 5′5″ / 165 cm Gender: non-binary  Pronouns: they/them Sexuality: panromantic / demisexual

+ has an affinity for the horror genre and isn’t afraid of anything; when playing a horror game or watching a horror film they are so blank-faced it’s almost terrifying + is really bad at remembering anything and tends to write down things they can’t remember, or Flowey remembers for them + enjoys involved activities like baking, assisting someone, gardening, etc.

character tag

Underlust (original concept by nsfwshamecave, who has left the fandom.)

Nickname/s: Lumi Date of Birth: ??? Height: 5′5″ / 165 cm Gender: non-binary Pronouns: they/them Sexuality: aromantic / asexual

+ is completely neutral on the existence of sex as a concept, but isn’t interested in it whatsoever + can have very open conversations about any topic, but at the same time lacks a filter and forgets about boundaries sometimes + doesn’t sleep very often at night and can be seen at absurd hours looking at cat videos

character tag

XTale (by jakei)

Nickname/s: XFrisk Date of Birth: ??? Height: 6′1″ / 185 cm Gender: cisman Pronouns: he/him Sexuality: panromantic / pansexual

+ keeps his hair as long as he does because he’s frankly just too lazy to cut it more than anything else + doesn’t really care about much of anything anymore due to the fact that nothing he does matters + he doesn’t really commit anything to memory, and when asked to recall something, no matter how important, he usually can’t very well

character tag

Ragnartale (by NaomyMikolMaria) (please note I’m a bit behind on this AU)

Nickname/s: Princess Date of Birth: ??? Height: 5′3″ / 160 cm Gender: ciswoman Pronouns: she/her Sexuality: demiromantic / heterosexual

+ secretly wishes that she had made an attempt to learn magic when she was younger + cares about a lot of people, but truly has difficulty processing whether or not she actually feels romantically for them + is almost blind to betrayal; while it will destress her, she’ll do everything in her emotional power to ignore it

character tag

#uthcs headcanon #uthcs pin #undertale #undertale headcanon #frisk #aged up character //

[zirkkun-uthcs]

General Headcanons (Charas)

This list includes short bits of information on the various Charas to be included on this blog. If you’re looking for a specific one, please use CTRL+F to search for the AU, due to the length of this list. Reminder as well that most of this information is entirely headcanon. If there’s canon information that I’ve messed up somewhere on this, please let me know so I can fix it and adjust accordingly!

Please note: When answering asks, I will first list the character being requested in the format of AU!Chara, but the nicknames here are listed because sometimes I drift off while writing and lean towards those names. Additionally, Chara in every AU here is depicted as an adult, whether it be the canon for the AU or my age-up depiction of them. In the cases where they are aged up, they will act differently from the original canon.

Undertale

Nickname/s: None Date of Birth: ??? Height: 5′6″ / 168 cm Gender: non-binary Pronouns: they/them Sexuality: aromantic / asexual

+ very abrasive when it comes to being blamed for something, even if they were the culprit + when they care about someone, they’ll do anything for their sake, no matter the cost + is extremely emotional and prone to changing feelings on a dime

character tag

Underswap (original concept by p0pcornpr1nce, who has left the fandom and deleted the content)

Nickname/s: Swapra Date of Birth: ??? Height: 5′6″ / 168 cm Gender: non-binary Pronouns: they/them Sexuality: panromantic / demisexual

+ will cause problems on purpose. but then, if caught, will apologize and clean up whatever mess they made + has an affinity for stuffed animals, especially those giants ones that cost like $100 a piece + does not have any sense of money and will spend ridiculous amounts in no time at all. don’t give them money

character tag

XTale (by jakei)

Nickname/s: XChara Date of Birth: ??? Height: 6′2″ / 188 cm Gender: cisman Pronouns: he/him Sexuality: biromantic / bisexual

+ likes to freak people out with sharp objects, just for fun. has more than one scar because of this + can be incredibly flirtatious, but will overall distance himself from relationships that become too in-depth + definitely actually needs glasses, but refuses to wear them

character tag

Ragnartale (by NaomyMikolMaria) (please note I’m a bit behind on this AU)

Nickname/s: Queen Date of Birth: ??? Height: 5′4″ / 162 cm Gender: ciswoman Pronouns: she/her Sexuality: aromantic / bisexual

+ is capable of empathy, but has been manipulated by Gaster so much to the point where many of her emotions are void + has a fascination with the color red; if she sees anything red, she would rather have it in that color than any other + her logic is contradicting due to the fact much of her own thoughts and opinions have been controlled

character tag

#uthcs headcanon #uthcs pin #undertale #undertale headcanon #chara #aged up character //

[zirkkun-uthcs]

Generic Headcanons (Toriels)

This list includes short bits of information on the various Toriels to be included on this blog. If you’re looking for a specific one, please use CTRL+F to search for the AU, due to the length of this list. Reminder as well that most of this information is entirely headcanon. If there’s canon information that I’ve messed up somewhere on this, please let me know so I can fix it and adjust accordingly!

Please note: When answering asks, I will first list the character being requested in the format of AU!Toriel, but the nicknames here are listed because sometimes I drift off while writing and lean towards those names.

Undertale

Nickname/s: None Date of Birth: ??? Height: 6′8″ / 203 cm Gender: ciswoman Pronouns: she/her Sexuality: demiromantic / heterosexual

+ is a stress baker, no doubt about it + the second she’s not in the presence of children or in a formal situation, she’ll drop swear words like they’re nothing, even with her formal sentence structure + is actually not the biggest fan of tea and prefers hot chocolate

character tag

Underswap (original concept by p0pcornpr1nce, who has left the fandom and deleted the content)

Nickname/s: The Queen Date of Birth: ??? Height: 6′8″ / 203 cm Gender: ciswoman Pronouns: she/her Sexuality: biromantic / bisexual

+ adores small animals and plushies; has a concerningly large collection in New Home + her throne room is covered in fall-colored leaves instead of a flower garden; there’s a large tree that lives just above the opening of the ceiling + doesn’t trust herself to make wise decisions and usually talks with Undyne or Alphys before deciding anything

character tag

Underfell (original concept by Vic the Underfella)

Nickname/s: Fell Queen Date of Birth: ??? Height: 6′8″ / 203 cm Gender: ciswoman Pronouns: she/her Sexuality: demiromantic / grey-sexual

+ often talks to the flowers at Chara's grave, pretending they are listening to her. + is fully aware of Flowey living in the Ruins, treats him kindly, but his timid nature makes her severely upset for reasons she can’t fully understand + is the wine mom friend of the group

character tag

#uthcs headcanon #uthcs pin #undertale headcanon #undertale #toriel

[zirkkun-uthcs]

General Headcanons (Mettatons)

This list includes short bits of information on the various Mettatons to be included on this blog. If you’re looking for a specific one, please use CTRL+F to search for the AU, due to the length of this list. Reminder as well that most of this information is entirely headcanon. If there’s canon information that I’ve messed up somewhere on this, please let me know so I can fix it and adjust accordingly!

Please note: When answering asks, I will first list the character being requested in the format of AU!Mettaton, but the nicknames here are listed because sometimes I drift off while writing and lean towards those names.

Undertale

Nickname/s: Mettaton Date of Birth: ??? Height: (box) 5′5″ / 165 cm (android) 6′2″ / 188 cm Gender: transman Pronouns: he/him Sexuality: panromantic / pansexual

+ acts confident to make up for his plethora of self-hatred + has no physical filter, in a way. doesn’t like swearing, but will not hesitate to destroy whatever is standing next to him to bits if he’s angry + can often get lost on one thought and lose sight of everything else around him

character tag

Underswap (original concept by p0pcornpr1nce, who has left the fandom and deleted the content)

Nickname/s: Metacrit, Happstablook Date of Birth: ??? Height: 3′6″ / 107 Gender: non-binary Pronouns: they/them Sexuality: grey-romantic / asexual

+ makes dance routines to go with Napstaton’s music + has talked to Asgore on more than one occasion and they’ve shared their problems with each other + secretly wants to have a physical form of sorts, but has no idea what they would be

character tag

Underlust (original concept by nsfwshamecave, who has left the fandom.)

Nickname/s: Bowtie Date of Birth: ??? Height: 5′11″ / 180 cm Gender: masc. non-binary Pronouns: he/him or they/them Sexuality: biromantic / grey-sexual

+ both likes and doesn’t like cheesy romantic things -- it really depends on how it’s presented + tends to be a bit too trusting right away, partially because he’s desperate for any kind of positive in his life + will definitely not hesitate to kill a bitch if necessary

character tag

#uthcs pin #uthcs headcanon #undertale #undertale headcanon #mettaton

[zirkkun-uthcs]

Misc. General Headcanons

This will include every other character that doesn’t have enough alternates to have its own post or its own AU page. If you’re looking for a specific one, please use CTRL+F to search for the character, due to the length of this list. Reminder as well that most of this information is entirely headcanon. If there’s canon information that I’ve messed up somewhere on this, please let me know so I can fix it and adjust accordingly!

Please note: Any of the younger characters on this list will have headcanons based on an older version of themselves. 

Undertale

Flowey Nickname/s: None Date of Birth: ??? Height: 1′6″ / 46 cm Gender: cisman Pronouns: he/him Sexuality: aromantic / asexual

+ despite lacking a SOUL, there are still some things he can feel with Determination instead + doesn’t like to Reset or Save very often if he doesn’t have to, since he knows it doesn’t FULLY reset anything in the timeline without a True Reset + his body has not aged physically, otherwise his flower body would have probably died or wilted at this point; instead, it’s given a life force by his monster dust

character tag

Napstablook Nickname/s: Blooky Date of Birth: ??? Height: 3′6″ / 107 Gender: non-binary Pronouns: they/them Sexuality: aromantic / asexual

+ tries to be confident in their music, but finds it really hard when they’re alone and the only people who’ve listened to it in Waterfall find it ear-bleeding + their lack of self-confidence comes from the fact that they lost all of their friends and family, and even when finding out Mettaton was their cousin, they can’t help but feel worthless he never told them about leaving + doesn’t understand compliments entirely; will react with confusion

character tag

Undyne Nickname/s: None Date of Birth: ??? Height: 6′10″ / 208 cm Gender: ciswoman Pronouns: she/her Sexuality: homoromantic / homosexual

+ the friend who will make fun of your silly hat but then beat up anyone else who tries to + is shockingly a talented barista; once taught how to use the different machines, she’ll pick it up in an instant + has managed to burn water at some point in the past

character tag

Mew Mew Nickname/s: None Date of Birth: ??? Height: 5′7″ / 170 cm Gender: transwoman Pronouns: she/her Sexuality: panromantic / asexual

+ likes a plethora of different kinds of outfits, but finds dresses to be the most comfortable to wear, so she wears them most often + acts a bit like a spoiled brat in many ways; refuses to acknowledge it + a bit of a money hoarder/gold digger similar to Muffet

character tag

Alphys Nickname/s: None Date of Birth: ??? Height: 3′11″ / 119 cm Gender: ciswoman Pronouns: she/her Sexuality: panromantic / pansexual

+ falls for people really easily and this is to her personal detriment, so she tries to focus it all on fictional characters + is horrible with flowers and other plants; they tend to die pretty quickly in her care + notoriously bad at picking out gifts for people, but that doesn’t stop her from buying like forty or so for someone

character tag

Muffet Nickname/s: None Date of Birth: ??? Height: 3′11″ / 119 cm Gender: ciswoman  Pronouns: she/her Sexuality: panromantic / demisexual

+ used to be a ghost, but one day possessed a spider-like doll in order to support the spiders of the Underground + can make good food out of just about anything -- even things that don’t seem edible + is really friendly when you get to know her, but can seem really abrasive with threatening-sounding jokes

character tag

Asgore Nickname/s: None Date of Birth: ??? Height: 8′0″ / 244 cm Gender: cisman Pronouns: he/him Sexuality: polyromantic / polysexual

+ talks to his flowers in the garden as a way of letting go of the stress on his mind + low-key terrified of echo flowers both because he doesn’t like the idea of the flowers speaking back to him, and he’s scared people will hear the rants he’s told his flowers in the castle when he sees them + any time he comes across some extra money, he’ll donate it to either someone in need or a charity

character tag

Asriel Nickname/s: None Date of Birth: ??? Height: 6′0″ / 183 cm Gender: cisman Pronouns: he/him Sexuality: grey-romantic / asexual

+ tries to make up for what he did as Flowey by doing as many good things as he can, especially for those he wronged + coping with divorced parents alongside his own, unrepaired trauma from originally losing Chara has left him fairly emotionally weak and he still considers himself as a “crybaby” because of it + takes it more personally than he should when someone doesn’t like him

character tag

Underswap

Asgore Nickname/s: Gardener Date of Birth: ??? Height: 8′0″ / 244 cm Gender: cisman Pronouns: he/him Sexuality: demiromantic / bisexual

+ keeps the Ruins looking almost solarpunk in a way, where there are well-kept plants and flowers in every part + is a big stress-cleaner; whenever he starts to freak out about something, he’ll just start sweeping or dusting or tending to his plants + is only a little bit better of a baker than UT!Asgore; still has many different kinds of pie recipes

character tag

Alphys Nickname/s: Axel Date of Birth: ??? Height: 3′11″ / 119 cm Gender: ciswoman Pronouns: she/her Sexuality: homoromantic / homosexual

+ secretly adores cutesy anime, despite her tough outer appearance + she has very high pain tolerance and extremely tough skin; if someone were to punch her, they’re more likely to hurt themself + will casually use an axe to chop food

character tag

Undyne Nickname/s: Scy Date of Birth: ??? Height: 6′10″ / 208 cm Gender: ciswoman Pronouns: she/her Sexuality: panromantic / pansexual

+ prefers action anime to romance or magical girls; her favorite is Kill la Kill + is more critical of things like animation and art direction than character writing and development + has a plethora of plushies on hand for the sake of Toriel

character tag

Napstaton Nickname/s: Napsta, NTT Date of Birth: ??? Height: (box) 5′5″ / 165 cm (android) 6′2″ / 188 cm Gender: transman Pronouns: he/him Sexuality: biromantic / demisexual

+ has a much clearer voice than Mettaton in UT because of the fact he does singing and rapping + personally asked for the white hair so he could be a white-haired anime boy + while he didn’t tell Metacrit where he was going was he left, he did tell them that he was leaving, unlike Mettaton.

character tag

#uthcs headcanon #uthcs pin #undertale headcanon #undertale #aged up character //

[zirkkun-uthcs]

General Headcanons (Gasters)

This list includes short bits of information on the various Gasters to be included on this blog. If you’re looking for a specific one, please use CTRL+F to search for the AU, due to the length of this list. Reminder as well that most of this information is entirely headcanon. If there’s canon information that I’ve messed up somewhere on this, please let me know so I can fix it and adjust accordingly!

Please note: When answering asks, I will first list the character being requested in the format of AU!Gaster, but the nicknames here are listed because sometimes I drift off while writing and lean towards those names.

Undertale

Nickname/s: W.D., G Date of Birth: ??? Height: 6′3″ / 191 cm Gender: cisman Pronouns: he/him Sexuality: demiromantic / demisexual

+ didn’t actually do anything wrong; died from an unexpected accident during a scientific experiment + a cheerful guy who likes cracking a lot of jokes most of the time + doesn’t really like physical contact at all because it makes him nervous (not exactly a full-blown fear, but he doesn’t like it)

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XTale (by jakei)

Nickname/s: XGaster Date of Birth: ??? Height: 6′7″ / 200 cm Gender: cisman Pronouns: he/him Sexuality: demiromantic / pansexual

+ cannot take a joke at all. sometimes can’t even recognize the tone in someone’s voice to understand a joke + genuinely has absolutely no idea that Ink’s emotions are completely limited by his ink vials and assumes he’s just a very emotional person overall with this weird taste for paint + hates all alternate versions of himself

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Ragnartale (by NaomyMikolMaria) (please note I’m a bit behind on this AU)

Nickname/s: Mage Date of Birth: ??? Height: 6′1″ / 185 cm Gender: cisman Pronouns: he/him Sexuality: aromantic / asexual

+ doesn’t actively pursue any relationship with someone unless he can find some benefit from it + has very little emotions despite having an otherwise strong SOUL + on the positive side, he’s a very, very good problem-solver! but the outcomes are not always morally favorable

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#uthcs headcanon #uthcs pin #undertale #undertale headcanon #wd gaster #gaster