Quirk Izuku AU;
Quirk; Dance Master/Dance Kind
His quirk allows him to play any music that he's heard and project it onto others, which will cause them to kinda of vibe with it or dance with it. It can change moods as well, so if someone's panicking then it will calm them down(if that's what Izuku wants to happen), or he can do the opposite, if Someone's calm he can cause them to panic. It all depends on what he wants to do. If he's just playing music people will just vibe. (He can also help people focus with the music. He can also heal people(mentally and physically) with this if he hums or sings along with the song.
Drawbacks: He can get frequent headaches, nose bleeds(minor), faint/pass out from over use(If he plays music for more then 9 hours at a time//used to be if it was longer then 1 song), sore throats, puking(happened once and it was overuse from a dare)
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I feel with this Izuku would just try for support course, and then work his way to Hero course to become a calming/healing hero.
Bakugou knows and helps him, first by helping him build muscle and then by helping him change emotions(Bakugou the angry Pomeranian) and then by how long he can sing or play music for(reason why Izuku can go 9 hours).
I'll Add more later.... But I do wanna roll with this idea and maybe have an actual book on here one day and not just as a one-shot(s) or an Idea sitting Idle.