Awesome. Fucking. Game.
No question. However, I think an awesome unlockable or immediate new character would be Blockhead because if you think about it, he'd be great in a fight. He can use his long tongue to bitchslap fighters and get out his tongs to shoot nails! Of course, he can normally fight like a real contestant much to the Conscience's surprise. :P Anyway, I also think that this game should be picked up by the major gaming companies as the second Newgrounds game to manifest into physical form. You remember what happened to Alien Hominid, don't you? In clsoing, this is like Super Smash Bros. on an acid trip. A fun and kickass acid trip.