I'm having a hard time coming up with anything someone else hasn't already suggested, but I will say Cool Spot is a totally decent game, which you wouldn't expect considering it's based on the 7Up spot. Also, if you do go the EverDrive route, Treasure made a four-player Yu Yu Hakusho fighter that's really good. They revisited the engine for their Bleach fighters on DS, and it was clearly an influence on Guardian Heroes.