Id like to fight Lelouch (code geass) or Light Yagami (death note).
First reason is that they are both very effeminate males, so im pretty sure I could take them.
Second they're arrogant douches! Who could do with a bit of a beating.
How would the fight go down then? I imagine alot of schoolyard stuff in play, starting with the "why are you hitting yourself?" moving onto indian burns, wet willies and finnishing of with a nice wedgie which leaves to the final depantsing.