Well it doesnt ahve to be exclusive nintendo has signed on snake which is definitely been sony lately but some more people for the list could be

the blue dragon kid that would be awesome to see him face master chief lol

also crackdown guy

maybe cortana or the black general guy or arbiter could be added in

also dante from devil may cry since capcom has been makin xbox some games lately

the psychonauts dude

also the resident evil 5 character or even a zombie

Does anyone else dream of a game similar to Super Smash Brothers but on 360 with all of microsofts great characters. Obviously itd have masterchief and maybe the bioshock guy or shepard from mass effect who knows.

What would your favorite character be to add to the list of fighters if such a game came out?

milk milk lemonade around the corner fudge is made

peter's vows at his wedding lol