When child-Idia sees “Subject ROS-3367A,” the creature that he accidentally releases when he shuts down STYX's security, he doesn’t call it a phantom.
He calls it a monster.
When asked about his family Grim responds, "I remember wakin' up hungry and alone. It was real cold. I was waitin' out there for someone to come get me for ages. What happened after that again? It's all so foggy..."
There is also a theory that the chimera in the opening scene of the game is an Overblotted Grim.
Comparing the sound of the growls...
And going back to the theory that the "ROS" from "ROS-3367A" comes from "Queendom of Roses" and Grim was based on Dinah from Alice in Wonderland...
And the game may be hinting that Grim killed Ortho.
This especially feels like how it would be in the raising Yuu au, where the three are childhood friends. Crewel has been done with them for a decade at this point
Grim Info Compilation part 6: Grim and the Prefect
Our first impression of Grim is his attempts to steal clothes from one of the sleeping students-to-be of Night Raven College.
He chases the prefect throughout the school demanding their clothing, until he is captured by Crowley.
He insists on taking the prefect’s place at the school as he can use magic. He is ejected from campus only to immediately return.
When asked if he believes himself to be the owner and the prefect to be the pet he responds, ‘of course,” which also comes up in Glorious Masquerade.
Upon realizing that the prefect has the ability to free him from his contract with Azul in Book 3 Grim says, “for the first time, I think I’m ready to recognize you as our prefect.”
Grim insists on sitting next to the prefect during Glorious Masquerade because “someone’s gotta look after ‘em,” and becomes distressed when it appears that the prefect may be harmed by the fire lotuses later on.
Grim will sometimes elude to playing games and watching movies with the prefect, saying more than once that he wants them to hurry back to the dorm to spend time together.
Grim is proud of how good the prefect looks in their outfit for Firelit Sky ( “That’s MY hench-human, after all”), asking them to buy him a toy from the marketplace.
The prefect’s participation in the exhibition match at the end of Book 2 is cut short by Grim striking them in the head with a Spelldrive disc.(While in-game Grim does not seem particularly concerned, novel-Grim is apologetic.)
Grim has a voice line of, “Spendin’ time with you ain’t half bad. So, uh…stick around, okay?”, and Grim’s jealousy of the prefect’s fondness for Stitch is a running theme in the “Lost in the Book with Stich” event.
Grim seems to greatly regret attacking the prefect at the end of Book 5, apologizing repeatedly once he has been saved.
Grim Info Compilation part 2: Animal vs. Monster vs. Cat vs. Dire Beast vs. Tanuki (pt1)
Grim has been called a variety of different things by the different characters: when he first appears Crowley repeatedly calls him the prefect's familiar but Grim insists that he is not.
Rollo makes the same assumption during Glorious Masquerade.
The prefect calls him a tanuki (an animal that is similar to a cross between a raccoon and a dog, “weasel” on EN) upon their first meeting.
Several other characters call Grim a tanuki throughout the game including Crowley, Leona, Ace and Kalim, but usually to insult him.
Grim has the joke, “that’s animal cruelty…not that I’m an animal” on EN, but that is something he has never said (there is a place on EN where Crowley refers to him as an animal but this was also an addition to EN: in his original dialogue, he is again calling Grim a tanuki).
The closest we come to Grim self-identifying as anything might be a line in the prologue where he says that dragons are “what all monsters yearn to be,” but it is unclear if he is including himself among “all monsters” or just making an observation about monsters in general.
When other characters call Grim a monster (Crowley, Ace, the prefect, Deuce, Jamil), they use the English-language word “monster" in katakana, audible in the audio.
In one scene Crowley says “monster” aloud, over a hidden meaning of another word: dire beast.
And that might be what Grim actually is, with Riddle, STYX technicians, Rook and Ace all calling Grim a dire beast at different times, and Idia providing an in-depth explanation based on an analysis performed at STYX.
Grim Info Compilation part 11: Envy, self-interest and more
Grim will often become envious of others characters: when Deuce wins a track-and-field award Grim’s reaction is, “How dare he show me up!”.
He is also envious of the clothes worn by the others in Firelit sky and he becomes determined to grow taller than Malleus during Glorious Masquerade, saying that he will get on stilts with the prefect and Deuce in order to overtake him.
Grim refuses to participate in the Phantom Bride event until Ace tells him that he isn’t needed, at which point he decides he is going with the group in order to prove how charming he is.
Grim happily buys souvenirs for himself in both Harveston and Firelit Sky (Epel: “somehow I’m not surprised”).
When Kalim’s wish for the Wish Upon a Star event is “for everyone to be happy,” Grim says it’s weird: “If ya ain’t usin’ a wish for yourself, then what’s the point?”
Deuce acknowledges that Grim is “a glutton who’s never heard of self-control and he can be really selfish at times.”
Grim seems quick to ditch classes and abandon responsibilities in general: in an important part of the Prologue he hunts down Ace (who is, himself, ditching out on a responsibility), only to get revenge by abandoning his punishment to run away.
He also runs away during Book 1, tired of the monotony of his classes.
Grim also attempts to ditch out on clean up after the drama of Phantom Bride, and he has a voice line of, “If Deuce comes lookin’ around for me, tell him I’m not here! I dumped cleaning duty on him then ditched.”
Both Ace and Deuce comment on this habit of Grim’s in voice lines.
Grim will occasionally make an astute observation about the situation at hand, pointing out the severity of their problems during Fairy Gala, convincing Ace and Deuce to cooperate during the Prologue and when Ace insults Deuce one time too often (causing Deuce to leave their VDC rehearsal so as to not have to put up with him) Grim observes, “You really gotta start thinkin’ about other people’s feelings before you open your mouth.”
Grim Info Compilation part 16: Grim, Malleus and Sebek
Grim names Malleus “Hornton.”
Malleus seems to enjoy teasing Grim.
When Grim falls in a vase during the Firelit Sky event Malleus says, “Don’t indulge him. This is what he gets for mocking a local tradition.”
Grim does not seem particularly intimidated by Malleus, using him as “a glorified nutcracker” during Firelit Sky and going back and forth with him during Glorious Masquerade about their respective heights: Malleus says that he doubts that Grim could tower over him even with the aid of stilts if he gave it a proper effort but refuses to elaborate on what he means.
When Malleus declares he will be sitting next to the prefect Grim refuses to allow it, saying that he’s got to look after them. Malleus acquiesces and sits next to Grim instead, and Grim looks pleased.
Grim and Malleus have an interesting overlap during Halloween where Grim repeatedly says that he does not want Halloween to end, and Malleus then makes Halloween last indefinitely (at the behest of visiting ghosts, not Grim).
Sebek and Grim seem to bicker often: Grim refuses to let Sebek sit next to the prefect so that Sebek can sit with Malleus (Idia: “another endless circular argument over something completely trivial”) and Grim wins a game of rock-paper-scissors for the right to retain his seat.
After the drama of the fire lotuses Grim says that he did so much work that the prefect didn’t have a chance to do anything but Sebek teases him with “are you certain (the prefect) didn’t have to constantly bail you out of trouble?” Grim insists, “I was protectin’ both my hench-human AND Trein!”
The two get into a snowball fight during the Harveston event, instigated by Grim after Sebek says that their chances of winning the race would be far slimmer if he participated.
In a vignette Sebek orders Grim to lead him to Ramshackle to fetch chairs at Crowley’s behest. Grim has Sebek open the door to a dusty room in revenge, though Sebek continues to give him orders.
Later Grim observes, “(Sebek) gets real annoyin’ real fast when it comes to Malleus.”
After seeing Sebek interact with Malleus in a separate vignette Ace says, “nothing you say’s gonna impress anyone after that sorry sight” and Grim agrees, saying, “You’re about as scary as a mouse.”
The two also overlap during Vargas Camp where Grim observes, “There ain’t a tunnel big enough for this guy’s ego.”
Sebek invites Grim to join him in early-morning exercise before the Harveston event, and Grim refuses.
Grim Info Compilation part 9: Grim, Azul, Jade and Floyd
Grim seems suspicious of Azul, calling him “real dastardly” (Azul: “I prefer to be called an intellectual”).
In a vignette Azul blackmails Grim into helping him and Idia with maintenance on Ortho.
Grim reacts with, “It ain’t my problem, so why should I go outta my way to make it my problem?” and Azul responds, “I was fully expecting this,” procuring a photo of Grim fighting with Lucius and making a mess of the teacher’s lounge (Grim blames Lucius for stealing his snack).
Grim changes his mind when Azul’s request is revealed to be dangerous (“You’d…get a blast of high-power technomantic energy to the face” - Idia), but he acquiesces when Azul adds a can of tuna to their deal.
Ortho reveals that the part that Grim retrieved could have purchased far more than a single can of tuna and Grim is displeased, but Azul explains, “We reached a perfectly amicable and mutually beneficial arrangement.”
During Glorious Masquerade Azul and Grim find common ground when they become equally absorbed in a tightrope walking performance.
Grim seems to have trouble telling Jade and Floyd apart from one another early on, asking Jade which one he is during Beanfest.
When Jade offers a strategy for the event Grim refuses to cooperate, saying, “Why do I feel like you’re tryin’ to pull one over on us? Well, forget it. I ain’t givin’ you squat!”Grim runs off during the Halloween party and eats all of the carpaccio off Jade’s plate.
Jade says, “Someone’s been a bad boy. Since I can’t have my carpaccio now, maybe I should have you instead?” but Grim is unfazed, saying, “that’s what you get for not watching your food.”
Grim instigates a snowball fight with Jade during Harveston, but he seems to have some lingering fear of the twins held over from Book 3, saying, “Just lookin’ at their faces makes me think back to when they were workin’ me like a dog.”
On the topic of what kind of activities take place in Jade’s Mountain Lovers’ Club, Grim says, “considering how intimidating the guy founding it is, it’s gotta be somethin’ scary."
Grim says “you gotta watch out for (Jade),” citing how he is always smiling but “sometimes he says even more ridiculous stuff than Floyd.”
Floyd’s response to meeting Grim for the first time is wanting to “squeeze” him, which is a threat that Grim seems intimidated by. Grim says that he is always worried about the twins “schemin’ something” every time he sees them, and is not fond of Floyd’s nickname for him, saying that it makes him feel like he’s being insulted. (Floyd calls him Seal because he is round.)
Grim and Floyd overlap in a vignette where Grim accuses Floyd of throwing out a mushroom he found simply because he doesn’t like mushrooms. Grim picks up the mushroom from where it hit the ground and runs away with it, ignoring Floyd’s protests.
Grim Info Compilation part 21: Stealing, Vil and More
Grim will blatantly steal food and he seems unashamed of it, saying that “stolen food tastes way better” and “everything tastes better when it’s forbidden.”
Grim steals carpaccio from Jade’s plate during Halloween (“Food’s way more appetizing when it’s someone else’s”), tries to take an apple from the prefect, decides to take apples from a farmer when Epel tells him no, goes after the prefect’s ice cream during Glorious Masquerade, steals a doughnut from Ace, clam chowder during Port Fest and hints at wanting to steal jewelry from Leona.
Much like how Grim is quick to insult Leona, he also makes a comment during Vargas Camp about Vil’s club members running away because they are scared of him.
Vil replies, “I simply give warning when they don’t do their jobs.” Grim responds, “That’s still pretty harsh.”
Vil has a voice line about finding Grim’s fur on his school uniform.
Grim does not seem fond of Vargas, who apparently would have Grim and the prefect sit on a bench that he used as a dumbbell during Vargas Camp.
I have seen questions before about whether or not Grim is actively floating around the school, as he appears to be, but this might just be one of the ways the game is adapting to the limitations of the visual novel format:
Grim asks the prefect to hold him for a picture, Deuce has a line about him “trotting around underfoot” and Grim asks Cater to lower his phone so that he can see the screen, which all may insinuate that he might just be walking around.
(He also has to jump up and down to be included in a picture during the White Rabbit Fes event)
Grim Info Compilation part 20: Grim, Riddle and Ruggie
Riddle says that he can sympathize with the prefect as, “I imagine it is difficult to make Grim heed your instructions. Heartslabyul has its fair share of problem students.”
Riddle encourages the prefect to go to him if they ever have their hands full with Grim, as he has “a lovely collar for him.”
Throughout Book 2 Grim seems to not trust Riddle, likely due to the drama of Book 1: he calls him “Ragin’ Riddle" is surprised when Riddle volunteers to help catch Ruggie (“What’s your angle?”) and says that he is “as square as ever” when Riddle leaves mid-investigation to make sure that no one at the dorm is breaking any rules in his absence.
Ruggie has a voice line about offering to babysit Grim for the prefect (for ten thaumarks an hour) and sharing grilled fish with them after Grim eats all their dinner.
The two meet for the first time in Book 2 when Ruggie uses his unique magic to force a trade for Grim’s sandwich (for Leona), which ultimately compromises Leona’s entire scheme to take down Malleus when Grim realizes what happened.
This experience may have contributed to Grim’s poor impression of Ruggie: when he learns that Ruggie buys food from the cafeteria to distributed to children in his neighborhood back home Grim reflects, “Never knew he had it in him,” and when Grim learns that Ruggie is refusing constant favors from Jack he says, “I woulda thought Ruggie’d be like, ‘sweet!’ if you offered to do stuff for him.”
Grim Info Compilation part 15: Grim's Experiences, Forcing and More
Grim is often surprising the other characters with all things the does not know that are considered common knowledge: Lilia exclaims, “How could someone in this world have truly never heard of Halloween?” with the ghosts explaining that it is one of their world’s biggest events.
Grim surprises Ace and Deuce by not knowing about the Starsending event, with Deuce saying that it is “hard to imagine someone not knowing what it is.” (Ace: “Do you know anything!?”)
Grim does not know of “The Righteous Judge” or “The Kindly Bell Ringer” from Glorious Masquerade, and seems to have never seen a barber’s pole before. Similarly, he did not know any of the “Great Seven.”
Grim also had never heard of Beanfest or Spelldrive, despite it being a “world-famous sport.”
Back in Book 1 it seems Grim had never heard of “overblot,” despite being a magic user himself.
Other things that Grim does not seem to know about are corn dogs (originally: takoyaki), the word “holiday,” or what skiing is.
He is also revealed to have never heard of “Wonderlinks,” described as an extremely popular gaming console.
It is not unusual for Grim to whine and plead until he gets his way: he throws a tantrum when Jamil refuses to let him join the Firelit Sky event until Kalim convinces Jamil to relent, harasses Crowley into allowing him to attend the social in Glorious Masquerade, invites himself to lunch with Jack and Ruggie during Port Fest and demands to attend the Tamashina Mina event, despite never being invited.
Grim and the prefect share a smartphone.
Grim may not have the best personal hygiene, saying that he washed his hands a day before, so he shouldn’t have to wash them again before he eats.
How warm Grim’s fur keeps him may be a point for debate: during Harveston he is unfazed by the cold, saying, “I got this nice, tick coat to keep me warm" (also mentioned in Book 4, though he says his "nose is gonna freeze over"), but he complains about being freezing cold during Vargas Camp.
During Vargas Camp 2 Grim is swallowed whole by a catfish.
Grim Info Compilation part 19: Grim, Idia and Kalim
Grim is not a fan of Idia, saying in a voice line that he started following Cater around in order to get Idia to leave him alone.
Idia seems fond of Grim, however, referring to him as “fuzzy companionship AND valuable emotional support” and offering to let Grim sit on his lap during Glorious Masquerade.
Creeped out by Idia’s smile, Grim refuses.
In a voice line Idia offers the prefect help with questions in class in exchange for getting Grim to allow him to pet him.
Idia mistakes Grim for a cat and tries to pet him right after Grim has been watching a horror movie about the ghost of an evil scientist. Grim faints (Idia: “I just wanted to pamper a kitty-cat”) and starts a rumor that the halls of the school are being haunted by an evil spirit.
One of Kalim and Grim’s earliest interactions is Kalim force-feeding Grim crackers and cheese despite Grim's protests.
Grim has said at least twice that Kalim “throws (him) off,” says “(Kalim) is TOO nice. Makes my hair stand on end.”
When Kalim confesses to being upset about not being chosen for main vocals for the VDC Grim responds, “You’ve had everything handed to you on a silver platter before this, I bet…imagine how I feel not even makin’ the cut for the audition to start with.”
Kalim apologies and Grim reflects, “gettin’ a sincere apology makes me feel like I kicked a puppy or somethin’. Ace or Deuce woulda hit me with a comeback…”