BerkeIium posted...
Ryu and Ken fit the definition just as well as Red and Blue do. Two street fighters trying to become the strongest street fighters in the world, all the while trying to one-up each other.
They can be rivals, but I'd say they share a friendly rivalry, they just trade a couple of punches and kicks (and maybe the occasional fireball), but that's it, if Bison comes up, they both go after him.
A more serious one would be Ryu and Sagat, in which one gets a lifetime scar and the other goes to the dark side.
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Battle starts here.