Deku is Miku
His quirk was apparently a vocaloid nerd. There was no other explanation, because how else would you explain an OP quirk that can restart a significant event in his day to Retry Now? And the army of Monstrous Flowers at his beck and call?
Because his quirk let's him do anything Miku did in the early 21st century, both in a PV and in the lyrics. Yes, he can make himself look like a deity to be God-ish, that's a no-brainer.
What happens when villains attack him, you ask? Well, he makes them love him, of course! After all, they can't become him, so they should cherish the limited time they call life. And no, he won't use the beam no matter what you say to him because it's too-
What? There's a nomu? And it's a bioengineered monster capable of mass destruction? Say no more.
One, two, three MIKU MIKU BEAAAAAAAM!
(He won't mention his other ultimate power: the ability to summon a time machine and travel back in time to any season when sakura blooms blossom)