[quote=@Sep]
<Snipped quote by Natty>

That's fine, I'm not actually familiar with his power set. Though if it works it works :P
[/quote]

He's basically completely invulnerable, but his powers activated when he was a somewhat large and out of shape teenager so he's "frozen" at that physical state making his body incapable of losing or gaining weight or muscle mass (taken from the wikia :P)