NOOOOOOOOOOOOOO, we just got done with that man.
But probably goku, since this is the dbz universe and goku is supposed to be the strongest in that particular existence.
Edit: just realized what forum this is. Is this a suggestion to have Superman in as a joke character? If so, while it would be awesome, they'd never do something like that. Though, if we had a superhero game with the gameplay of esf...