Experienced hero in training

Katsuki was the last UA person alive bedsides the few teachers and principal who kept it as a police academy instead as the Quirks were disappearing as more quirkless kids were forming katsuki was kidnapped and Experimented on he has many scars all over him he now has a new Quirk called spirit he can see, hear, commute with them and when they are half in control he has there quirk but the user loses sleep and they must be close to him in one way

he was sucked Into a portal with his teacher aizawa who is 31 to another dimension where quirks still existed and instead of UA it was called monarch academy

he has a dark side that he has when he ever fights he has PTSD, really REALLY BAD separation, Social and regular Anxiety, eating disorders and even more fears than normal Katsuki was willing put into class 1b along with his teacher as his bodyguard and guardian figure

He became half Blind due to a villain Attack he became emotionless and even more quiet after that aizawa helps him with doctors, sleeping and eating as he forgets or will starve himself on propose

the others notice there closeness of them two, they get suspicious at their every move katsuki becomes even more paranoid he would always hold onto aizawa's hand, shirt or Plush he would never let go of them even when sleeping or eating tiny things

he loses control of his dark side and Bullies kids to make him feel better but he would never stay long enough as the shock collar was always there