He's got super strength, I'm pretty sure whatever internal body restructuring happened also allowed for strong enough arms to withstand it. I can't remember which one it's in but he's holding back a lot with all his enemies so as not to kill them. Also he's an adult in some of them and he named himself so of course a teenage boy who suddenly got super powers is gonna be like "I'm a man now!"
He's got super strength, I'm pretty sure whatever internal body restructuring happened also allowed for strong enough arms to withstand it. I can't remember which one it's in but he's holding back a lot with all his enemies so as not to kill them. Also he's an adult in some of them and he named himself so of course a teenage boy who suddenly got super powers is gonna be like "I'm a man now!"