Alright, here we go...
Grey Fox, aka Ninja-MGS
Crono- Chrono Trigger
Magus- Chrono Trigger ((F-yeah))
Frog- Chrono Trigger ((Unlikely, but could be hella fun))
Mega Man ((X)) - Duh.
Zero- Mega Man X series
Diddy Kong w/Dixie Kong ((Think Ice Climbers. If you haven't played DKC, you won't get it))
Wolf- StarFox Series ((I'd play as him. F-you fox and falco.
evil ))
Jade - Beyond Good and Evil ((Fantastic game. Go play it. Now))
Rayman - Rayman games ((Evil Bunny would be funny))
Lyn- Fire Emblem ((first American release GBA title))
Belmont- Castlevania series ((Any really, though I'd like to see Julius))
Soma Cruz- Castlevania: Dawn of Sorrow and Aria of Sorrow ((He's the most likely since he's one of the most recent "heroes" in the Nintendo line-up))
Alucard- Castlevania: Symphony of the Night, Castlevania: Dawn of Sorrow ((@#$% Yeah...))
Jonathan and Charrolette(?)- Castlevania Portrait of Ruin ((Could be fun as a IC team-up. Just popped into my head now))
And now, some chars I've seen I don't think should be here...
Bomberman... Meh. Not a fan of the idea.
Pac-man... @#$% NO!!
Earthworm Jim... Too obscure... Then again, so was Mr. G&W
Sonic... The most overrated character ever since Master Chief.
Everytime you say "Master Chief should be in Smash Bros."... a Nintendo rep loses his wii-ngs. Please... Think of Nintendo.