Spidey, because...
I'd be Venom or Spawn
aaaaaaaaaaaawwwwwwwwwwwwwww yyyyyyeeeeeeeeeeaaaaaaaaaah!
Damn, that's a tough one. I'd say the Mighty Thor
Why a hero? I want to be Dr. Doom, so I may talk in 3rd person and own a country along with having diplomatic immunity.