To be fair, Eri’s quirk has a recharge time and only can rewind for so long before needing to charge, indicated by her horn. Also all quirks need your brain to be intact to use, none have been shown to be automatic, so... sever the head or destroy the brain.
Saying that, I realise what monstrosity he would be as every heteromorphic type quirk would be active on him at once...
But he’d also be invisible so it’s okay. And he can also permeate, teleport, reflect attacks, gets stronger the more he’s stressed, can harden, can turn to steel, has every single strength enhancing quirk and multiplier including One For All, etc etc.
I’ve made a new eldritch creature.