[@olcharlieboi]

That does bring up a question though. Since the mutation quirks didn't instantly transform their users, why would it do that to Charles? I mean you'd assume it may take a little bit of time instead of just instantly transforming and probably killing him. You could do it that way and have it be a slightly watered down version of their quirks as his body wouldn't be prepared to just shift like that. 

It's probably why they never showed Neito copying a full mutation quirk like that, it'd be...well it'd probably be horrific to see him try.