(Realistically In-Character) Yandere Headcannons (& What kind of GN!MC triggers it.)
TW: Gross side of anime (sexualization of minors for example) mentioned in Levi's section with a clearly marked start and stop
TW: Asmo's cannon behavior
(I highly suggest reading this specific post on AO3 instead.)
This is less about forcing the brothers into specific tropes and more like what the brothers would be like in worst case scenarios if MC hadn't softened them up enough. It still could be them in particularly bad situations even after the fact in some cases. Things they'd do in bad ends if the game had real routes basically.
An emotionally scarred naïve, pushover MC that's always being dragged into dangerous situations sets him off. You've gained his affection, but not necessarily his respect. A MC like that ends up becoming an odd combination of a Lilith replacement (regardless of gender, it's about how different the role is from his literally and figuratively demonic brothers) and a romantic interest.
I don't think I need to remind you what happened to her or what happened when he thought he'd lose Belphegor to Diavolo do I? For all his boasting what he thinks is best for you isn't necessarily going to be best for you, but so long as you stay in a relationship with him he'll never respect your complaints.
He's far too used to being the uncompromising "father" figure and you remind him too much of a child regardless if you're past your thirties or you're seven feet tall and have more curves/muscles than the most ridiculous anime characters.
He's easily thousands of years old and the literal embodiment of pride, it's hard enough for demons close in power and experience to go against him. Even before then he was an angel meant to "guide the ignorant humans" and other angels alike.
He'll only truly believe your complaints if you leave him and stay gone until he apologizes and promises to change. Which honestly might not happen before you die even with your expanded lifespan.
Not just because of his pride, but because he has a good chance of realizing how much of a danger he is to you once separated. In fact even if you try to stay with another brother he might try to force you into the human world permanently "for your own good."
Whether you're terrified of him, Belphegor, or worse both, he feels responsible for your state even if you get over it eventually.
He didn't talk Diavolo out of this, he "chose" you, he locked Belphie in the attic, he let his pride in his magic cloud his judgement, he couldn't stop him from killing you, and he's almost killed you himself several times. Hell, he's completely sure he's killed you in worse ways in alternate universes. Diavolo's timing was far too convenient for it to not be true.
Beel may be the visible protector, but he's the "true" protector who makes sure Beel is even around to protect anyone else. It's only right that he "protects" you from his brothers when all but two have tried to kill you. (Even Asmo seems seconds from killing you if you choose the wrong answer after they find out you freed Belphie. He definitely would've tried if it didn't after his pact with you imo.)
Regardless if they have the best intentions or not Lucifer always does what he thinks is best and this kind of MC isn't one he'll ever listen to as an equal. He's all too eager to let you hate him so long as he believes you'll be safe.
He's kind of the odd one out in that he actually become worse the more self sufficient and stoic you are. If you don't need his protection he'll quickly start to feel useless and unneeded no matter how much you reassure him.
This causes him to panic and absolutely spam you with gifts, sending him even further into debt. If you try to refuse them, even for his own sake, you just make it worse.
At the same time he'll be constantly stealing from you even if he hadn't been before. He needs it to feel close to you, but then he feels bad and tries to return the really sentimental gifts back to you playing it off as you losing them.
If you figure it out (he's truly trying to deceive you, not the blushy tsundere nonsense or fun heists) and yell at him for it that can either be the end of the relationship or the start of his spiral. Deciding to forgive him for it, regardless of how much you yell at him, is just enabling him at this point. Rather, the longer you stay away before coming back the more desperate he'll be to make sure you never leave.
If you don't figure it out what sets him off is the rush he gets when you look at him gratefully for the first time. It's better than any win at the casino and he knows he's gotta play it smart. He doesn't steal big things often anymore, it'd lose effectiveness if he did, just things like pencils and hair ties to feel close.
It starts off well intentioned and relatively innocent. He begins to pry into your deepest fears and traumas, intent on protecting you from them the best he can.
No mere human can win a serious game of luck against the avatar of greed, much less resist the pull of the second most powerful brother using all he's got against them.
Don't worry though, he just wants information from your family and friends. Unless he finds out they were to blame, but sweet, stupid Mammon would never be able to murder MC's loved ones and cover his tracks like that without blurting it out right?
But eventually returning items doesn't work anymore. You're back to your stoic, independent self and you've never needed his protection once. He needs your gratitude more than anything. It starts off small.
"It's basically just like a surprise haunted house," he tells himself. You're dragged on adventure after adventure "gone wrong" with him. If you refuse he's more than happy to bring the danger to you.
Mammon just wants you to depend to on him, to see him as irreplaceable instead of the first step towards his brothers. Not to leave you with lasting trauma.
Although if you're still trying to avoid depending on him, maybe something is better than nothing...
The worst MC for him is a cheater, but instant death isn't much of a character analysis.
The second worst is the kind of person that lies to make other people happy or indulges others even if they aren't interested. The kind of person that doesn't like clubs, but lets Asmo drag them there anyway or lets Beel eat their food before they're done.
Even a doormat is less dangerous because at least they'll show signs of resentment. Not only is a genuinely kind but unable to stand up for themselves MC completely unrelatable to him now it's also a harsh reminder of his past. That used to be him and the more he tries to understand the more painful memories and resentment from that time come up.
It's especially bad if they're too afraid to say when something is bothering them. Not okay with explicit sex and nudity in what you thought was only a slightly lewd anime? (TW! START) Incestuous undertones? Explicit rape scenes with no warnings? Oddly sexual noises, poses, outfits, and behavior from a "loli" that's explicitly a child? (TW! END)*
He's so deep in weeb hell that despite all his complaining about how everyone hates otakus he doesn't even bother looking things like that up before watching with you. None of his male "friends" online have ever cared. Very few people in his community care, much less stop watching because of it. In his mind if you like anime and/or anything more than Nintendo or casual games just like him you'd either just ignore it (like him), know the signs, tell him ahead of time, or tell him now.(**)
He genuinely can't imagine hesitating to complain for any reason and he's not good at empathizing even by demon standards. He has no social skills (besides manipulation) whatsoever and the very little experience from genuine friendships before becoming a hikkimori faded long ago.
He needs someone with firm boundaries. He doesn't have much faith or trust on the best of days with all the assurance you can give him. If he can't trust you to tell him when you don't like him or don't want to do something he'll never trust you period. If you can't say no to other people then how can he trust you to say no to dates or stop yourself from falling in love?
He's already at his limit when it comes to fighting his sin. This isn't him not trying hard enough or not getting enough reassurance. The amount of envy you see is actually his carefully controlled release.
Give him any reason to doubt you when your behavior is already so alien and unpredictable to him and he'll pop. If you don't break up it most likely ends in him killing you in a jealous fit if he can't prevent you from never interacting with anyone else ever. Something that's fairly unlikely with Lucifer and his other brothers in general around.
I believe he was worse than Satan was in terms of pure destruction for a long time. I mean, he does just casually summon a mythical beast (easily enough to do it in his sleep too, literally) and wrecks the house often without a single apology. He gets pathetic punishments like being banished to his room when he never wants to come out of it too.
It's why Lucifer introduced otaku culture to him in the first place and lets him get away with so much despite not being one of his favorites like Mammon or the twins.
(Go here (tumblr) or here (AO3) for my expanded headcannons on Leviathan immediately after the war.)
The third worst partner for him is someone that's just as eager to a be an anti-social shut in as him. It doesn't matter if you're not that into what he's into or even just using him. If he's pretty much the only one you hang out with regularly and you take every chance to be alone he'll start to see you as the perfect partner in the most unhealthy way. No one can steal you away if no one can get to you.
He won't even be that devastated if you refuse to talk to him. A life size poseable figurine with unlimited outfits he can rant to is fine too. Although it may sound contradictory he wants you even more if he has competition, so long as you avoid them. Not much fulfils his sin's needs like getting some"thing" someone else wanted.
If he starts sneaking out of his room and going outside so you don't you have to you know something big is going on. It might not be the improvement you and his brothers seem to think it is.
It's much worse if you're a "tsundere." You don't actually have to be one, but if you say complain about the worst parts of anime/otaku culture while still liking anime and etc. he'll see you as one. Try to keep your feelings to yourself because a demon bf seems dangerous or you're insecure? Tsundere.
Get jealous over anything that steals his attention even once? Tsundere and completely in love with him. Jealousy is pretty much the only love language he accepts without question.
Once you're past the point of no return he becomes completely delusional in regards to your feelings. Run away? MC you don't have to do all that for his attention. Although it may seem less dangerous you've been thrown from the frying pan into the fire. No matter how violent or insulting you become he just applies anime/VN logic.
There are far too many abusive tsunderes for him to see it as anything but an expression of love and demons are already naturally violent. Even things that really piss him off like destroying his collection make him see you as a badly trained puppy that needs discipline and love.
Death may be painful, but is being controlled by him for the rest of your life really that much better?
I honestly can't see canon Satan exhibiting yandere behavior. He's much too self aware to justify it to himself or get delusional and much too controlled to do it anyway. Yandere isn't really yandere without the delusions or at least irrational behavior imo.
I can however see him be part of a typical abusive relationship wherein he lashes out with rage, but I'm really uncomfortable writing that. It's way too close to home in a way that yandere isn't imo.
Besides, I believe canon Satan would immediately break up with you the first time he seriously hurt you if he had any real affection for you at all.
He probably wouldn't even stay friends if you kept pushing to get back together in a way that made you sound desperate and "okay with" the abuse.
Saying things like you "love him enough to tolerate it" or saying you can change him and deal with it until he's better for example would turn him off.
Already cannon, just check out his reaction when you say you were thinking of someone else while being with him after the Belphie reveal. I'm also too uncomfortable with the implications on this one. I can't really not see a snapped Asmo doing dubious stuff at best if he doesn't just murder them so I can't write this.
(MAJOR TW!) He canonically threatens to commit necrophilia on MC's corpse and implies he'd sexually assault them while they're alive too. IDC if it's "just a threat" or not, it's too much for me not think of that every time he pops up. It's not impossible for the other yandere brothers to do something similar I suppose, but you can remove it entirely and make them asexual and their motives don't change while Asmo's center around it. (MAJOR TW! END)
While I reject cannon Asmo's extremely serious flaw and give him other ones in addition to his narcissism, it's still impossible for me to not see it for a yandere scenario.
Although honestly I think Asmo just straight up murdering them in a fit of rage is the most likely scenario anyway.
He doesn't seem like the type to keep himself from killing them purposely or not after losing control and I think he'd be too socially aware to believe he can just kidnap them and have it all work out if he hasn't snapped.
This might sound odd at face value, but I see Beel as a lot more likely to exhibit full on yandere behavior when you accept Belphie's offer to date both of them. He's an absolutely terrible influence when he suggests ways to "keep MC safe."
Belphie isn't above trying to manipulate him with subtle reminders of Lilith's demise if he's really concerned about MC and Beel only wants to see the best in his twin. He's already canonically mentioned running away from his brothers with Beel and MC.
Beel loves all of his brothers, but I can't see him ever choosing anyone over Belphie. Not after loosing Lilith, who he also choose Belphie over. Again, Beel's a pretty straightforward demon who likes to think the best of Belphie and has a huge amount of guilt for not realizing he was locked up. It'd be very easy for Belphie to manipulate him into something.
He might not even need to however. It's canon that Belphie and Beel feel what each other feel, literally. They're not real life twins, they're two sentient parts of the same being. Think more like if someone cast a spell on Cerberus to be able to separate, but they all still shared the same psychic connection than about human twins.
Which means Beel will be able to feel every time Belphegor feels overprotective, worried, jealous, and his suffocating feelings of love just like he canonically feels his stomachaches and sadness.
All it takes is a few accidents or close calls (that may or may not be orchestrated by Belphie) and he might start to agree with him on some things before Belphie starts trying to convince him in earnest.
Rather than being worried about losing you emotionally he's worried about losing you physically. He would be the type to be genuinely trying to protect you from harm rather than using is as an excuse.
He definitely doesn't want to lock you up or anything, but what's the harm in making sure one of them is always with you? What if you got attacked or had an accident and couldn't call them or they couldn't get there in time?
What's so bad about staring down every demon and shady sorcerer potential threat that looks at you? It's not like he's hurting anyone, he's just getting ready to in case they do. He's the family's protector and you need it more than anyone.
He's always there to cheer you up with your favorite food when no one wants to talk to you anymore. He's not sure why they're being so rude and it makes him even more annoyed with them and suspicious when someone acts differently than the new normal.
Beel would prefer to see you leave him for someone else if that's what really makes you happy than get hurt or even die. If he truly believes you're safer with someone else he won't try to keep you from them and might even encourage you to leave him.
In extreme scenarios he'd rather have you hate him than let you die, but it probably won't get to that in most cases because he'll only go full yandere without Belphie if you let him be suffocatingly overprotective. Unless you're an absolute dumbass with no sense of self preservation and/or are always getting hurt he'll back off the almost second you tell him to in the beginning.
It's hard to hate him anyway when he "protects" you from the outside world so sweetly and sorrowfully, letting you abuse him as much as you want so long as you don't hurt yourself. Especially considering it's basically a game of good cop bad cop with Belphie.
Last, but definitely not least is the main cannon yandere. I've already gone over him a bit in Beel's space and everyone who's made it far enough already knows what he's capable of.
I want to focus on what makes him unique. It's not often that you see a yandere that not only actively wants you to date someone else, but almost seems happier when you do so than when it's just him.
I believe part of that is because of the whole "two halves of one soul" that share everything deal they've got going on, but I also think part of it is his him trying to worm his way into MC using the path Beel made.
It could just be coincidence, but I find it important to take note that Belphie asks you after you say you like Beel despite the fact that a lot more Belphie fans like Beel than the other way around. The things that attract people to Beel over his brothers are mainly his honesty, kindness, and "purity." Things Belphie lacks.
Don't get me wrong, Belphie's always tied for my favorite at worst, but he's very manipulative, obsessive, a bit of a tsundere, a vengeful murderer that literally laughs at his brothers' horror, and has pervert vibes despite the way he insults his brothers for it. It'd make a lot more sense for it to be the other way around.
So again could be coincidence, but it's also perfectly in-character for him to try to get at Beel's partner and hope that Beel can convince them to like him too. If only so he isn't left behind. He already does something similar by convincing MC to help him make up with family. After all there's no real requirements for it, you don't actually have to flirt with Belphie or have high intimacy scores to get it.
But if it was him first Beel probably wouldn't ask and Belphie may or may not try to convince MC to date Beel too. On one hand he does genuinely seem happy about sharing (honestly the creep kinda sounds a little too happy sometimes,) but on the other hand he can be pretty selfish. Personally, if Beel had strong feelings and he knew MC wouldn't freak out I think he definitely would.
I feel like he also sees it as insurance. Even if you get mad at him or tired of him you still have Beel and Beel would never leave him. That gives him a chance to win you back or at least be near you and get Beel's secondhand happiness.
It also has the potential of being a bit of a threat. Breaking up with only one of them would be super messy and probably ruin it with the other. So breaking up with him, especially harshly, has a good chance of making you lose Beel too.
In other words unless you really hate him it's too risky so you might as well just let him worm his way in. And if you do really hate him it means Beel is really likely to leave you and you'll be completely alone. Which then allows him to turn Beel against you completely or manipulate you into coming back using that as leverage.
It lets him get away with a lot more than he otherwise would, but in this case he'd probably use those chances to isolate you instead of hurting you for any sadistic reasons. He doesn't need anyone but Beel and neither do you in his opinion.
As for the worst MC, I believe it'd also be an antisocial shut-in without a huge sense of self-preservation. It makes him feel less jealous at first, but then it makes every interruption and interaction with his brothers seem even worse in comparison.
Belphie's always been clingy, but between losing Lilith and being kept away from Beel he's become almost panicky from untreated PTSD. He never really feels satisfied, he just gets greedier every time you give into him when you don't want to.
With a "normal" MC he already knows he can't just immediately rip you away from the people you're with regularly. It keeps him distracted and lets him feel like he's making progress. Being a shut-in makes it very easy for him to isolate you from his brothers and convince Beel you wouldn't be too lonely with just them.
A suicidal MC or one not particularly concerned about losing their life worries him, regardless of how mad you were at him. He knows all too well how easy it was to manipulate and kill you and yet you don't even seem to look out for yourself.
He's not one to downplay that being the "Lord of Emptiness" and traditional symbol of depression himself. He's driven countless humans to suicide through a lack of sleep and constant nightmares and suffers from depression himself. He knows the signs better than any other brother, better than any angel really.
He's not losing someone else, not even if you hate him for it. He'll gladly play bad cop with good cop Beel if that's what it takes. You're not that happy here anyway, maybe you'll be happier without his annoying brothers and outsiders dragging you away from him.
If you're only dating Belphie he's still too lazy (and maybe just the slightest bit too sane) to try to drag you off somewhere, convince Beel, and deal with the fallout. If he thinks a romanced Beel is already halfway convinced to come along however...
If Belphie's lazy ass starts getting you things all the time without you asking so you don't have to leave the house do yourself a favor and beg Diavolo for protection. You're on the Bad End path and there's not much you can do to stop it.
Either you don't change much and Belphie's already started trying to convince Beel, or you suddenly develop an active social life and he panics thinking you're trying to leave him. Good luck MC, you're going to need it.
*Levi stans might hate me for this (I mean I am one, but), tbh my real life experiences kind of taint my perception of him. I mean he canonically has a Ruri-chan body pillow and an adult Ruri-chan 3D breast mousepad. Regardless of if it's adult Ruri-chan or not it's still sleazy and suspicious even if I know Solomare is probably doing it to avoid making Ruri-chan feel like even more of a love rival and not to make him a creep.
**I absolutely do not condone this type of victim blaming at all. I absolutely hate it actually and I was really pissed off when I wrote it tbh, but I've had to deal with irl constantly when interacting with male anime fans and thought it was fitting. It's fully intended to be a serious flaw that MC should be rightfully upset about. I'm sorry if it wasn't immediately clear, but I didn't want to break character.
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Obey Me As The Golden Girls Quotes #2
Asmodeus: “I do love the rain so. It reminds me of my first kiss.”
Simeon: “Aw, your first kiss was in the rain?”
Asmodeus: “No, it was in the shower.”
Diavolo: “Is there anything else we can get you, MC?”
Barbatos: “A little tea perhaps?”
MC: “I’m not in England, I’m having a heart attack!”
Mammon: “I wouldn’t be caught dead in that dress.”
MC: “You’d have to be dead six months to fit in it.”
Leviathan: “Oh, Lucifer! Thank goodness you’re here!”
Mammon: “Arrested for prostitution! I can’t believe it!”
Beelzebub: “Lucifer, we’re innocent!”
Lucifer: “I know that. I can’t believe these dumb cops would think anyone would pay money to sleep with you.”
Simeon: “You...you...you rude person!”
Lucifer: “Go easy on him, Simeon.”
Diavolo: “Let me tell you about a lesson I learned when I was a little demon.”
Diavolo: “If you hold the bird gently, the bird will stay.”
Diavolo: “If you squeeze the bird, it’s eyes will bug out.”
Mammon: “How do I look?”
Lucifer: “Mammon, you look incredible!”
Mammon: “You really think so?”
Lucifer: “I really think so. I’ve never seen you look so stunning.”
Lucifer: “Who’s the designer? He deserve a Nobel prize for this miracle.”
Satan: “Is that all you care about? Money and applause?”
Mammon: “And sex. For which I generally get applause.”
Mammon: “No. And if I start acting like him, pull the plug.”
Asmodeus: “Mammon, at 2 AM this morning, I was entertaining a gentleman caller when Lucifer opened the door at the most inopportune time! I coulda lost my balance and chipped a tooth!
Mammon: “You think that’s annoying? He came into my room last night when I was re-enacting the plank scene from Peter Pan!”
Satan: “What the hell goes on at night in this house?!”
Solomon: “These your roommates?”
Solomon: “Which one’s the slut?”
Asmodeus, Belphegor & Mammon: “I am.”
Lucifer: “Asmo, wake up, my partner will be home any minute!”
Asmodeus: “Oh! Where’s my shoes!?”
Mammon: “Do we have any orange juice left?”
Satan: *stares at Mammon while pouring the rest of the orange juice into his glass*
Satan: “No, we’re all out.”
Asmodeus: “It’s so hard to dress for the psychiatrist. You wear black, they think you’re depressed. You wear red, they think you’re angry. You wear a negligee, they think you want to sleep with them!”
Solomon: “Why aren’t you arrested more?”
Mammon: “So, big shot, did you get the tickets?”
Satan: “Can’t you say ‘hello’ first?”
Mammon: “Hello, big shot. Did you get the tickets?”
Simeon: “Is that all you Italians know how to do? Scream and hit?”
Diavolo: “No! We also know how to make love and sing opera!”
Lucifer: “Now what’s wrong?”
Mammon: “I lost it, Lucifer!”
Lucifer: “You never had it, Mammon.”
Diavolo to MC: “You’re still as pretty as a ladybug sunning itself on a lily pad on a misty spring day, south of savannah.”
Mammon, mumbling: “Could you be more specific, big daddy?”
Asmodeus: “How do I look?”
Leviathan: “Like a widow in mourning.”
Asmodeus: “Good, he’ll know I’m available.”
Solomon: “Asmo, did you know at a truck stop in Tuscaloosa they have an egg dish named after you?”
Asmodeus: “Really?! How’s it prepared?
Lucifer: “Over easy.”
Mammon, filling out a crossword: “‘I am nothing but a cheap, tawdry slut’.”
Satan: “Don’t tell me...Is it...Asmodeus?”
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Hi! Of that's okay could i request big brother headcanons for the other brothers?👉🏻👈🏻
The Demon Bros Acting Like Your Big Brother
See Mammon’s here
• Gets jealous easily if you start spending time with his brothers more than him. You mean a lot to him and he doesn’t want his brothers’ constant nagging on him to rub off on you (it never could, Luci. don’t worry)
• If you so much as look at something through a window when you’re out with Lucifer, the next day he’ll have gone back and gotten it for you
• Through this, he learns what type of things you prefer, so his gifts are always the best - a secret only the two of you know
• Helps you study for tests, but only if you ask (his version of asking, which is him saying “MC, have you been studying enough or do I need to find you a tutor” and you responding with something along the lines of “I think the best tutor in the Devildom is right here”)
• Is often too shy to share his admiration for you verbally, so he thanks you for always being there for him through quality time and the occasional little gift
• Despite being addicted to his computer, he’s a really good listener and will go hours without it if you need him for anything
• Teaches you about all the best Devildom games, and the two of you spend hours together in bean bag chairs snacking and gaming, eyes watering from lack of sleep but you’re having too much fun to stop
• Incredibly sassy, but in a loving way that only you understand
• Always looking out for you, whether it be physically grabbing your arm to stop you from stepping in a puddle or reminding you of a test you had next week
• Will beat someone up if they bully you for being a human, and I’m not saying that he’s done it before, but he’s done it before. That’s his human, and no one, demon or otherwise, is going to hurt you
• Loves to play board/card games with you on Sunday mornings, specifically ones from the human world. He finds them fascinating and loves the time you spend together teaching him the rules
• All of the brothers are overprotective in their own way, but Asmo is always obvious with his care for your wellbeing
• If you’re about to do something dangerous with Belphie or impulsive with Mammon, he’ll always find himself in the right place at the right time to remind you to think before you act in the most casual yet stern older-brother way possible
• Teaches you to dance before the first ball that Diavolo throws, which at first you thought was a joke offer, but he takes dancing surprisingly seriously
• (16+) Almost has Regina’s mom from Mean Girl’s vibe. Won’t walk in on you, but if you find an extra pack of condoms in your drawer the night you told him you were going out to the bar you knew how they got there
• Will cover for you if you forget an assignment or are in trouble
• Also will cuddle you whenever you miss the human world or just need someone to be there for you
• Secretly loves to prank his older brothers, especially since no one ever suspects him. The two of you pull some seriously good pranks on Lucifer and laugh together as he erupts “MAMMON!!!”
• You learn how to cook together, there are videos on DevilTube he’s been meaning to watch, so sometimes you wake up early together and cook breakfast for everyone
• He got into the habit of journaling when he was locked in the attic, and now he finds the pages filled more and more with how proud of you he is and little memories he has of you throughout the day
• When you fall asleep against him during a movie night he wraps an arm around you cautiously and makes sure your neck won’t be sore when you wake up the next morning
• As an official member of the “Lucifer, You SUCK!” club, he will get in on the pranking with you and Beel from time to time, and his evil streak makes it all the more fun
A/N: Sorry some of these are a bit short! I really liked this tho heh I’m a sucker for wholesome demon bro content
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