[Emu]

I heard somewhere a long time ago that Sonic was "definitely" in as a base character and Knuckles was "definitely" in as a secret one, but I don't know how reliable that is. I think it was corallary to that April Fool's joke IGN or whoever pulled a few years ago where they spliced Sonic and Knuckles into a Melee game.

Edit: Also, I think Pit counts as the "Wild Card" for this game. He was only in two games.