I Haven’t Seen Sibling Dynamic Shindeku In So Long - Blog Posts

little izuku & cg/big brother hitoshi headcanons !!

— request by @dragon-queen21 —

✩₊˚.⋆☾⋆⁺₊✧ ✩₊˚.⋆☾⋆⁺₊✧ ✩₊˚.⋆☾⋆⁺₊✧ ✩₊˚.⋆☾⋆⁺₊✧ ✩₊˚.⋆☾⋆⁺₊✧

💚 - izuku has been regressing since middle school and he usually regresses to an age range of 2-4. he’s quiet and incredibly self sufficient after years of raising himself under a working single mother. even while regressed, he maintains a journal where he meticulously logs things and data collects about what he likes and doesn’t like. he has a system and it works for him. when he starts training for, and starts attending, ua, his regression gets knocked to the back burner while he focuses on everything else happening in his life. it basically leads to a year of him burning out and impurely regressing because he keeps putting it off.

💜 - hitoshi finds out about it when he joins the hero course and moves into the dorms. he’s a chronic night owl and while you’re not supposed to leave your dorm room after lights out, that’s a guideline at best and aizawa has too much favoritism to actually punish him for being out and awake at three in the morning. he finds izuku huddled up in the commons, crying after a nightmare, and genuinely stands there awkwardly for like thirty seconds before sighing and deciding that the better thing to do is to comfort him. of course, this leads to a lap full of his sobbing classmate/rival and a VERY awkward conversation in the morning where izuku spends two hours writing a super long text explaining age regression and apologizing for his behavior and hitoshi just responds with “ok 👍”

💚 - it leads to a never-ending cycle of little izuku seeking hitoshi out constantly since he’s the only one that knows about his regression and then big izuku furiously apologizing in the morning, swearing that it won’t happen again (and it always goes). little izu is very attached to hitoshi— he views hitoshi as this insanely rad older kid (you know, like a little brother would) and hitoshi is really uncomfortable with the attention but it’s like… a pleased discomfort. he’s never had anyone treat him like he’s the coolest thing ever so he just rolls with it. eventually, hitoshi tells him to stop apologizing after the fact because he doesn’t hate hanging around a baby that looks at him like he’s the literal definition of awesomeness and that leads to them having their first ACTUAL conversation about it.

💜 - they’re both autistic but in very different ways so their dynamic struggles just as much as it works. Izuku is very understimulated all the time (especially while small) so he’s constantly talking, stimming, and seeking out things to do. hitoshi, meanwhile, is insanely easy to overstimulate but he knows that if he says anything about it, izuku will shut down and never speak again just to make him comfortable and that’s not what he wants. the solution is a truly incredible amount of parallel play while they listen to hitoshi’s safe playlists music or while hitoshi wears noise canceling headphones (that one usually only happens when he puts on a show/movie for izuku or has had a really bad day). sometimes hitoshi will use little izuku to help him study because the kid’s literal special interest is heroics, he’s got an insane memory, and hitoshi has neither of those things so going over study cards with izuku or making up games quizzing him is both fun and beneficial for hitoshi’s grades.

💚 - hitoshi struggles a lot with physical affection while izuku is very tactile. it leads to a lot of back and forth where they try to figure out the middle ground or ways of signaling when something’s okay. hitoshi is fine with hand holding (as long as he has sleeves that can cover his hands or he’s wearing gloves) and he can cuddle in small doses, so that’s 95% of what izuku initiates. he’s always holding hitoshi’s hand and he’s very sweet and considerate about making sure that hitoshi’s okay with it (to the degree that hitoshi has to constantly remind izuku that he, hitoshi, is the older one who should do all the worrying). in return, hitoshi gives izuku a lot of large stuffed animals wearing his shirts (or cologne for smaller things) so izuku has something to cuddle with still. izuku’s favorite is this really dumb looking stuffed crow that’s wearing yellow rain boots and a yellow bucket hat that hitoshi offhandedly won him during a festival (could be school festival or the class deciding to go out for the weekend). hitoshi has no idea why he likes it so much but izuku is obsessed with it.

💜 - because of izuku’s excessive cataloging, it’s actually really easy for hitoshi to take care of him. they weren’t really friends prior to this point so most of what he learns about izuku comes from his journals. he learns his favorite food, his favorite toys, his favorite movies and tv shows, his favorite sensory objects, and what he enjoys doing; and, for the most part, a lot of this stuff either overlaps with izuku when he’s big or he states in his journals where his interests deviate and his theories for why that might be. it gets to a point where hitoshi will overhear someone asking about what izuku might like for his birthday or a holiday and he’s just able to answer despite the fact that he and izuku rarely hang out around other people so practically no one (except iida, uraraka, and bakugou) know that they’re even friends. it also means that hitoshi knows about izuku’s triggers and a lot of the traumas that he’s experienced. there’s a lot that izuku purposefully redacts when he lets hitoshi read his journals, but there’s still a lot there that makes hitoshi realize that they really aren’t that different after all.