Great battle. It would be a great battle. But for some reason I think Sephiroth would win (With wounds) and say something like "Hmph" and go away.
Cotto
chucky
gorilla
An ape!
gigantosaurus
Liopleurodon
the python
trex
Silver Surfer.
Megaman would most likely win if he was in a fight with Knuckles the echidna.
punisher
Wolf.