Naturally I accept all challengers who haven't fought me in these before or similar (thus, regardless of how awesome they are, not Joker, Inferno, Repster, or Vapor) and as always would suggest you be somewhat skilled--I tend to throw planets at some people, wheras others I only use punches. Why am I so random? Not even I know!
Anyway. You bring your own battlefield/character. I'll use Metal Man. In case you didn't know, there's virtually an entire artwork gallery of him now. No one picture is 100% correct, but if you look around you may get a good idea. I'll soon put up a gallery listing the pics and who made them.