Now here's an interesting question...
If they did throw in another MegaMan character, what theme would you want them to have TatsuCap Remixed?
Well, that would depend entirely on the character, now wouldn't it? Guess I'll start chalking up a list.
Megaman - Probably would be the title theme for MM2, like it is basically everywhere else.
Protoman - Well, his theme would fit perfectly for him, without a doubt.
X - Opening Stage music from either X or X4, I'd say. Or Storm Eagle, if they'd ever touch other stage music.
Zero - his theme from X, no question about that one.
EXE - "The interspace of the Electric Brain" was it? The one they used in Onimusha Buraiden.
That said, I really wish they'd put X in a fighting game... I mean, they've used practically every other MM main character they've made (Aside from ZX and Ryuusei).