Ok, well, i try not to make the rivalies based on what the characters look like, more of like how they are similar character wise and styles...Ok, so here goes:
Andy vs Guy
Two characters that I think would be a great addition to the CvS games, and similar...Both ninja-esque characters, and both really don't get the credit they deserve always being in the shadow of other characters in their respected games....
Billy vs Vega
You can have the battle of the henchmen, both have weapons, and it's a contradictory of styles....you think Vega might win easily cuz of his speed, but Billy can manuver around well and has pretty good reach...so i dunno....
Cody vs Robert Garcia
This would be cool, cuz I'm thinking of a potential storyline...maybe because I can see Robert turning into a bad guy just like Cody did.....I'm thinking Cody would try to convince Robert that all this "good guy" character is really not him....Maybe Cody goes into South Town looking for trouble....
Athena vs Rose
Two incredibly powerful "psychic" users, I dunno if they are telepathic, but I can see them having some philosohpies in common, maybe a triangle relationship that makes Rose see Athena as a potential enemy since she uses "psycho power" something that she associates with evil, like in M. Bison
Ok, that's all for now, I will you y'all laters
-The Geese