Can't believe there is no thread for this yet...
Every Belmont. You could make them play different. Don't only rely on the whip, give them specific fighting styles. Brawler, Acrobat, martial Artist, hell you could even give one or two a morning star instead of a whip.
Hector and Isaac. Summoning monsters in combat could be really cool. Like a mix between a regular fighter and the pokemon trainer in brawl.
Jonathen and Charlotte. You fight as Jonathen, while Charlotte is in the background, some of your moves could just be getting Charlotte to do a spell, their special could be them joining together for one of their big spells.
Eric Lecarde, with a ghost version as a must. He could be your standard spear character. I'm sure they could find away to do his pole vaulting in a cool way.
John Morris, see Belmont's.
Joachim, he's an awesome character, and his fighting style could be awesome.
Walter, i just wanna see what he has to say to Drac.
Soma, I could see some cool stuff with him. Like getting new attacks when he kills the monsters that interfere with combat. Also, same as Walter. lol
Sypha, and Yoko as a skin swap. they are just too similar. I would say the same thing as the Belmont's. but the Belnades aren't really warriors.
Grant, his possibilities are so much. I'd like to see him start out as a boxer, with the ability to pick up weapons strewn throughout the stage. Also some wall climbing would be cool.
Albus, some gun kata maybe? Maybe not? I just wanna see some gun play in this game.
Maxim Kishne, he'd be this games ninja character. Jumping around, flipping, throwing his shuriken.
I would LOVE LOVE LOVE Cornell. I doubt it would happen. But maybe because this is non-canon fan service it could be possible. Especially if 8ing is in fact making this game (it could be there nod to Bloody Roar, the series that made their name mean something).
It needs Pumpkin. I'd love having him as a funny character in every Cv game. He's kinda like my un-official Cv mascot.