Izuku has a quirk of a lion as he is only able to turn into a cub. Due to extreme difficulty with his class bullying him(just the boys) he grew tired of it and transformed into a lion scaring the shit out of the boys as they now cry like little kids. The boys were told time and time again to leave him alone and now they messed with the wrong person as they continued. They tried to make him get imprisoned for attacking them with no reason but soon their downfall came due to their ignorance.

Ship

Izuku x harem

Most of the girls replace class a girls as the girls I'm class a is in class b