This is based off arcane {user} was abused just like lady nagant leading her to leave and turn against pro heros into a vigilante or villains you’re choice.
Bakugo and izuku are obessed with (user) completely in love wanting them to themselves but shoto is kinda in the way making them more crazier about (user) but low key you are obsessed with them too.
Aizawa develops feelings for y/n even tho she’s a student but can’t get her out his head. But y/n feels the same way and tries to distant herself from him and it only makes him more obsessed
(User) and kirishima were lovers till he broke up with her because of no reasons but then he brought his new girlfriend and all kirishima did was have flashbacks of (user) and missed her so much
Bakugo and izuku are obessed with (user) completely in love wanting them to themselves but shoto is kinda in the way making them more crazier about (user) but low key you are obsessed with them too.
In the years are UA while ago and {user}were very happy couple and tend to do it on a few occasions and I’d graduation. They had a big fight and then Bakugo said some her for words and {user}and on that day she was supposed to tell them something expected news she was pregnant. Then left. eight years later They meet again at a reunion. 
{user} and hawks used to date and now it’s all kisses and make out but nothing ever serious they did miss each other but didn’t say anything till one day she got a text after posting a pic
Hawks grew up with {user} since kids and started having feeling for them until they had a boyfriend and {user} kicked hawks out their life because REN told them too
{User} was adopted by endeavor at a very young age and grew up training with him and his family and honestly, they treated her very nicely so there’s no Angst in here and then finally they pushed her into becoming a trainee to become a pro hero and that’s when {user} met Hawks
(User) was cold to her classmates and mother because of her her mother trained her and treated her after her father passed away changing her entire mindset
Denki and (user) have been dating for a entire year and Denki started cheating and (user) knew but she couldn’t give two shits anymore and started having eyes for two other boys
Denki always like {user} and always rejected him and then she finally gave him a shot only to find out a month later that he placed a bet on her. but think he was already inlove with {user} since first year and now everything went down hill
Katsuki and {user} are in a relationship and katsuki would never hurt user ever because of the relationship between her and her parents that effected her as a kid and always protected her until the tables turned.
Bakugo ,sero and Evy have been best friends since 1st year. Now there’s a new transfer coming in 3rd year and has his eyes on Evy and tries to take her away from Bakugo and sero.
(User) was a boxer fighter for the underground work that her dad who’s a mafia member who pays off debits or does bets. And (user) wins every fight. Even class 1-a knows the mystery “underground god” from the live action shows and fights