oneshots + hc's ☼ multi-fandom

brother hc's !

katsuki:

you're twins

over protective of you hands down, can't change my mind

most likely the peace maker of the family, like your dad.

honestly no one in UA thinks you're actually related, i mean you don't really look the same apart from those red eyes

he'd probably confide in you a lot, especially after all that shit with allmight goes down.

katsuki probably sees you as his best friend, and shares everything with you

~ you know each others deepest darkest secrets
helps you and kiri study and you have fun study dates (if you call katsuki screaming at both of you fun)

MAKE HIM SPICY FOOD !!
~ like if he's feeling down, make him anything spicy
~ for no reason at all make him spicy food

you'd also be close friends with izuku as well since you obviously grew up together but i feel like in high school you probably don't talk as much since you're close with mina, kaminari, sero and kirishima

both each other's cheer squads, like during the sports festival you're both screaming your heads off. you lost your voice the next day lmao
you have a pretty close relationship with each other that you just know what the fuck is up with each other.

~ like you can tell if katsuki does a certain thing, how he's feeling and go into sibling mode and help him out

~ he's the same with you, and he just goes full on brother mode and comforts and makes you your favourite food

he may not express it but he loves you more than everything, like it's you two versus the fucking world

you guys started this weekly thing. a cooking competition. you both get your mom to buy a bunch of ingredients and just make a meal out of it. you're both so competitive, no ones actually winning you both keep tying and you're mom just loves that you're spending time together 

izuku:
you're his older sister (you'er 19)

you're actually becoming a teacher at UA

you got your dad's quirk, which was a fire manipulation type quirk.

and you really wanna see what can become of the up and coming heroes.

surprisingly, you're nothing like izuku, you have a stronger, less shy personality

you started an internship with aizawa actually, and kinda forgot to tell izuku, so when you walked in your long green hair similar to your brother and those cute freckles, poor boy got so shy and shocked the minute he saw you

~ katsuki recognised you before aizawa could introduce you and said in front of the whole class

~ "you're dumb deku's sister aren't you" a big ass smirk on his face

~ "and you're that explosive boy that got chained up at the sports festival am i right?" you slyly said izuku sweating in his seat

both of you aren't as close as the others but you share your interests

you both love talking about heroes and quirks together, you actually told izuku to study different quirks, it inspiring his hero analysis books

you both love spending time with your mom, and weekly family dinners are a common occurrence, since you're always working and don't get to see her as much as you would like

fun fact you got an internship with the flaming ball of trash know as endeavor, since you wanted to learn more about your quirk, and you actually met your boyfriend at that internship

~ it's actually todoroki's brother natsuo, yes todoroki's brother (still haven't told izuku about that one yet)

shouto:
you're a year older than shouto

you're both in the same class at UA, since you just inherited your fathers fire quirk.

sure the giant flaming ball of trash never paid you any attention, you still trained and managed to get in doing the normal process

like katsuki, you both confide in each other a lot, since you're both mentally scared.

you were behind shouto when your mother burnt his eye with water. you have a scar on you left arm from the splash.

you both think therapy is laughing about your father while slurping on cold soba.

you're also close with fuyumi and natsuo, cause family trauma brings everyone together ig

shouto cares for you so much, and you honestly do absolutely everything together.

i feel like shouto devotes so much time to you that he just has you constantly on his mind

you literally have to tell him to care for himself a bit more

if this baby is feeling down, bring as much cold soba to that room as you can and just have a nice talk and have some sibling bonding time

both of you enjoy training together, ice against fire. you also have a game to see who can lift the most in the gym, you being the reigning champion

you both have little outings on weekends to go and see your mom, and spend some quality time with her

you have the tightest bond out of all the siblings on this list,  because you've both been through so much neglect and shit that you both just have each other

kirishima:
you're his younger sister by like a year or so

omg you're literally fucking twins tho, bruh

no body actually realises you're siblings, because you look so much different cause eijiro has red hair, while you have black hair.

you become such good friends with denki, sero, mina and surprisingly even katsuki.

you're both super close like everyone else, but like you have that protective brother, younger sibling vibe

he loves you with all his fucking heart
HEART SQUEEZE !!

you helped him pick out things for his room, telling him how manly it was gonna look !!

you're honestly each others therapists, like you just talk about everything together and know each others deepest darkest secrets

you actually get along with katsuki the most out of his friends, you just have a good relationship and he treats you like the little sister you never had which is so cute

when eijro first brought into the dorms, and you met all his friends and aizawa, you have now just become his 21st child and counting, he lets ejiro bring you around all the time since you're a good kid and you like his cat

you are the smarter kirishima out of the two of you, so when baskugou isn't there to give him his hard study sessions, you help your bro out cause it wouldn't be manly if you didn't