Alright, I'm gonna suggest a few, just for the hell of it.

Alucard (Castlevania: Symphony of the Night)
Banjo & Kazooie (Banjo-Kazooie)
Isaac (Golden Sun)
Vanessa Schneider (P.N. 03)
Nightmare (Soul Calibur)
Jango Fett (Star Wars: Bounty Hunter)
Viewtiful Joe (Viewtiful Joe)
Fei Fong Wong (Xenogears)
Firebrand (Demon's Crest)
Jake Armitage (Shadowrun)
Geno (Super Mario RPG)
Captain Falcon (Super Smash Bros.)
Ash (Evil Dead: Hail to the King)

So, I'd say that's a pretty good mix of well-known and obscure characters. I'm not saying that any of these characters will necessarily be used, I just did this mainly to give people ideas.