You could play with it a little too. Like for instance, I'm sure there are characters who can speak more than one language. If characters had unique intros/voice clips when talking to each other, you could have, say, Ken speak English to the American characters and Japanese to the Japanese ones. Karin, too (probably). Gief and Kolin could say unique things to each other in Russian, and more generic things to other characters. Etc.
Alas, I don't think there's a fighting game (or any game, really) that's ever done something like that.