Wario Wario Wario
Smash Legend
If there are bosses in the game, I think it'd be really cool if they were PM Wario Man/Giga Bowser style variants of the existing cast based on all their evil clones and brainwashed forms - Dark Danny, Plankton's robot SpongeBob, Evil Jimmy, Power Trip Rocko, so on. Maybe throw in Primal Self Garfield if you want to get really deep with the cuts.