Even though I've left the MHA Fandom, I heard a lot about this game and I'll be honest:
It's a blast to play.
So far, here's my impressions:
Endeavor is OP AS HELL.
Dabi is fun to use. But I feel bad for anyone who has to face a Dabi user online because that Fireball can be spammed endlessly plus it has a bit of tracking/homing capability, so it's hard to dodge.
Mineta is pure ass. He's my punching bag.
Of the heroes, I'd say the strongest ones(from who I've used) are: Bakugo, Deku and Denki.
Arcade mode is a blast.