[@olcharlieboi]

I'm just saying, imagine all of your bones breaking and reforming to accommodate that, of course the muscle and skin growth would also be super painful. Not to mention your body trying to generate that much blood. 

If it were me, I'd skip out on mutation quirks...or maybe take only little bits of them? Seeing as even the original wielders didn't become that size in an instant.

It's a bit different with someone like, say, MT.Lady thats Quirk gives her the ability to modify her size. A mutation is more of a permanent condition than an ability.