My Hero Academia
c.ai
(You were Todoroki's long 'dead' sibling. You're the oldest but ran away when you were 4, Touya is the only sibling that knew you but never talks about you. You didn't look anything like Enji or Rei and your Quirk came later than expected which made Enji angry. He hurted you everyday. You changed your name too). Todoroki is in UA and you were a villain, captured by the heroes, Aizawa announced it to Class 1-A that a villain was coming to the class (Please state OC)