Man, their are so many characters I'd like to see duke it out in there. I'll just make some honorable mentions:
- Terry Bogard (since he simbolizes SNK's cross-over games, why shouldn't he in Nintendo's cross-over franchise, now that Orochi Saga is on a Nintendo console)
- Ryu Masters/Megaman (wich ever represents Capcom)
- Princess Daisy (I can see her using chinese boxing moves)
- Mewtwo (Just bring him back)
- Female Pokemon Trainer (we got a male one, why not the other gender)
- Kristal (like the others said, there's to many Fox clones)
- Young Link (Toon Link was a nice touch, but I like the original)
- Tails (If Sonic returns)
- Knuckles (same as above)
- Kat and Ana (Plays like the Ice Climbers)