Everybody talks abt the bakugous adopting toga, now get ready for: the togas adopt bakugou
They adopt him when he's around 5 years old, after an accident with his Quirk awakening heavily injures his mother, putting her in a medically-induced coma. His father isn't capable of taking care of a child after that, and katsuki is sent into foster care. Part of him has given up on the idea that his dad would ever take him back, but the other part is clinging onto the hope that his mother would wake up and find him. Wherever he is.
The Toga's foster Katsuki for a few months initially, which turns into a full year. Himiko, about 6 years old, likes the idea of having a new little brother.
(I've heard theories before that Himiko already had some other unnamed siblings since she's described as "the oldest daughter of the family" but to keep things simple let's just say she was an only child up until this point.)
(Also, I don't know whether this is canon or not, but while Himiko is her first name, we aren't sure if Toga is her real last name. But again, to keep things simple, let's just say that it is.)
Katsuki was a tough nut to crack, or maybe he would be if his foster parents ever really tried. From what we see in Toga's backstory, I assume they're not really there for their kids emotionally. As long as they eat three meals a day and have a roof over their heads, they've done their jobs, or at least that's what they think.
Katsuki and Himiko are left alone a lot. Maybe their folks are always busy at work or just didn't spend much time with them. Either way, the two become closer as the only kids in the house.
Now, canon Katsuki would probably be really judgemental about Himiko's gorey interests, but in this AU, he has literally almost killed his mother. He's in no place to judge and he knows that. No matter what crazy infatuation this girl has, it's got nothing compared to what was practically a murder.
Katsuki's a little more closed off at this age, kind of like in the canon storyline, but at age 5-6. Having lost his parents, his friends, and being put in some stranger's home, he's not the type to really show off anymore. He's hard to get to know, but Himiko never stops trying.
Despite everything, a bond begins to bloom.
Katsuki and Himiko are inseparable. They do little kid things like Katsuki going "watch this!" Before doing something cool and making sure his sister gets to watch, and Himiko cheers him on like he's just done the most amazing thing in the world. And to her, it probably was.
This is where Katsuki's show-offiness begins to bloom again. He loves showing his sister all his achievements. A perfect score on a test, an award from the sports festival at school, no matter how big or small he shows it to his sister who always cheers him on and encourages him to keep going. He works hard to get better at school, does well in sports, all to get his sister's attention, which she gives generously. She loves watching her little brother succeed in everything. Everyday she's so, so proud of him for something new. She's proud to call him her brother.
Katsuki's personality rubs off on Himiko, too. She starts to get a little competitive, especially when the two play against each other. Be it badminton, tennis, or even just a game of tag, these two are unstoppable. And there's never a sore loser because one will always be proud of the other no matter what the scores are.
Himiko also rubs off on Katsuki, more than she'd like to admit.
I don't think canon katsuki was ever the type to be grossed out or queasy about gorey things. He'd probably find dead animals on the side of the road and call his sister so she could check it out too. As they get older, he brings along a camera, so he can take pictures of all the bloody details for her to examine later. By now Katsuki has been legally adopted, though there still isn't much of a bond between him and his new parents. They are proud of his achievements of course, but they prefer to show him off at parties like a showdog. He prefers Himiko's way of showing her pride in him way more. It feels more genuine.
Katsuki and Himiko aren't exactly delinquents, but they do get into trouble a lot. Katsuki has grown to be a little more violent due to Himiko's influence, enjoying seeing the blood burst from someone's face when it comes in contact with his fist. After he beats someone up, he likes to take a moment to examine his handiwork. A broken nose, a black eye, a tooth landing somewhere, he finds joy in it. He's definitely more of a bully in this AU, not out of anger, but out of pure bloodlust.
At this point he hasn't heard much from his dad, but he visits his mom at the hospital now and then. He gives her updates on his new life, tells her about Himiko, and all his achievements. Part of him doesn't really think she'll ever wake up again. But another still clings onto the hope.
Katsuki and Himiko are middleschool outcasts. Weirdos. Freaks. They don't have many friends, but they have each other, and that's what counts.
Katsuki is still very into heroes, but he let go of the idea of ever becoming one. The shame from his Quirk awakening has left him afraid to use his own Quirk for almost ten years now. It's Himiko that encourages him to use it, calling it a beautiful ability that should be shared. It takes a while, but by graduation, Katsuki is dead set on becoming a hero. Not for money or fame, but for his sister.
Katsuki has also been very supportive of Himiko's interests from the beginning. In fact, he encourages her to become a nurse. After middle school she starts studying medicine, and by the time Katsuki's at UA, guess who's Recovery Girl's cute little sidekick/apprentice.
Himiko gets a front-row seat to all of Katsuki's high school achievements. She cheers him on from the sidelines as he wins the UA Sports Festival, while also treating all the poor souls who fought against him. This is actually how she meets Ochaco. A real meet cute.
She gets angry at how the awards ceremony went, and even got Recovery Girl to use her status at the school to speak to the teachers on her behalf. She's still pretty ticked off by the time they get home, and tells Katsuki to throw the medal away, but he doesn't. He keeps it in his room. It's a symbol of the first time in his life that someone aside from his sister acknowledged his abilities, his Quirk, as a good thing. Aizawa's speech during his fight with Ochaco was proof. After that, he follows his teacher around like a lost puppy, and in turn Himiko does, too. Now he's got two little blonde kids tailing him, and he just gets used to it at some point.
Katsuki's personality is a lot less angry and more a...weird kind of friendly. He got like, half a cup of bimbo-ness from Himiko, as well as a couple of her more tame friendly influences. But he does sometimes get a little too close, and asks questions very bluntly, sometimes offending or making people uncomfortable. But considering 1-A is just a mosh pit of weirdo high school kids, they all get along just fine.
Katsuki and Izuku reunite at UA. It was actually Izuku who approached him. Having missed all the middle school bullying since Katsuki was in another school at the time, the same one Himiko went to, he's a lot more confident. The two have a grand reunion and become better than best friends. They, along with Himiko and Ochaco, hang out together a lot in and out of school. It gets to the point that Ochaco gets a little too happy when she gets injured, knowing she'll get a free pass to visit the cute nurse at the infirmary. Izuku gets to join Himiko on the front row to all of Katsuki's victories, which assigns him as Vice President of the Katsuki Fan Club instantly.
I have so many more ideas for them and I kinda wanna draw/write more about it, so tell me what you think! If this gets very little attention my shyness and short attention span will probably shift me to something else😅
