Note : contains Canon x Oc, skip if uncomfortable!
Yuuna was born with a rough childhood, though he barely remembers things from when he was under the age of 9, all he knew was that-- mommy and daddy didn't love each other. they fight constantly, the only happiness he remembered was being with his only friends, katsuki and izuku that he met in kindergarten, when he was away from his family, though when his quirk appeared first out of all the kids in the kindergarten, it started hurting him, he gets constant headaches and so on, he couldn't speak properly due to the glitching from his quirk, he'd often hurt his classmates so he had to wear baby mittens, as if they think of him as someone who needs to be pampered to live.
at home, it wasn't like yuuna was being mistreated, he was just.. neglected i suppose, emotionally, not nutritionally or physically, just, his life was devoid of love that was supposed to be given by a family. so when the day of his 10th birthday arrived, he was.. happy? not for the right reasons, his parents died in a car crash on their way home from buying his birthday cake. for unknown reason, he became more aware of his surroundings, his glitching lessened and his pains eased. he was brought to the adoption center and after about 3 months, a family of 5 came and asked the employees the quirks of the kids, yuuna thought no one would adopt such a high maintenance child so he gave up wanting to be adopted, that's when the social worker approached him to ask if he'd like to speak with the family, the family was.. kind, gentle, and understanding. instead of looking at him weirdly, they spoke highly of how cool and unique yuuna's quirk was, yuuna's eyes shined with hope, hoping the family would be interested in him, at the end of the day, yuuna was adopted by the family.
turns out, the family was- well more like families, was a joint of 4 best friends who first divorced their husbands, and married each others husbands, and the family consists of 3 boys, starting from the oldest to youngest, basil, valuette and arley, and the newest addition to the family, yuuna. the main reason for them adopting yuuna wasn't just because of his strong quirk, but rather- they saw how painful his quirk can be, and fortunate enough, the then youngest child, arley, has a neutralization quirk called sync anchor that neutralizes yuuna's quirk to ease his pain even when using his quirk.
fast forward to 5 years later, yuuna and his family have been living in austria for about 4.5 years with the new adopted childrens in the family, fleurette, and yuuna's unofficially adoptive children, mellin and millia. though he was young, he had the courage to adopt childrens of his own due to his newfound connection with the government, with his family also having connections with high ranking people, yuuna is currently training to be a hero, though faster than most kids, he already works as a junior pro hero from his country's new system where kids who have trained their meta quirk and had quirk awakening are able to work alongside adult heroes as pro heroes like the rest. going to the present, the war happening in japan means most of the heroes in other countries to be deployed to japan to assist the pro heroes there. that being said, with pro heroes being the teachers of most schools, the student's are unable to go to the next grade or graduate till the war is over, sick of being stuck at home, yuuna uses his wealth to gather resources to import to japan while going there himself with arley. he goes to schools who are basecamps or refugees, spreading the foods and needs of the people of japan.
by the way, did i tell you about the fact that after several years, katsuki and izuku manage to find yuuna's account on the internet and izuku was able to contact him? no? well now i'll tell you about them! izuku was scrolling through all might fanarts when he sees a very well done all might fanart that defines all his features, then, he sees the username. "yuunaluvsxcode". the same user he saw when he followed yuuna's instagram during his elementary school days. immediately he chats the user and a reply quickly follows "hi! yes, i'm yuuna! who might you be? get it? cuz it's all might? LOLOLZ" seeing the speech pattern, izuku introduces himself and turns out he is the same person he befriended during his childhood days, they talked and talked and izuku got his number, soon after he informed katsuki about yuuna's contact with izuku and gives him his number. not long after, about 9 months after constant contact and meet ups in arcades, katsuki confesses his love to yuuna from when they were kids and how he had wished he said it sooner, of course, yuuna accepted his confession and they dated. now back to the present. yuuna arrives at UA, not only did he come to help the refugees, but also izuku who these past few weeks had became a vigilantee, how did he know? well katsuki informed him, a fun fact about yuuna is that his school provides coding classes for students when wanted, he uses his knowledge to locate izuku's wherebeing by tracking his phone. when yuuna meets katsuki, principal nezu was there too and we head to the 1-a dorm and principal nezu introduces me to the students, well as a friend of katsuki and izuku (katsuki was too embarrassed to tell people he got a boyfriend). Yuuna stayed in the dormitory for a while, and after they brought back izuku, he took care of izuku while he rested. and for the upcoming war, helped the students train their quirks.
