if I had to guess, I'd say Tribes, Mishima, and maybe even Imperial...
my guess is based on the comics, in which the main characters were Mitch, Valerie, Max, Big Bob, Crenshaw, and Golotha...but I don't remember an Imperial character being featured in the comic (if there was, it would have been Murdoch)...
but that's only an uneducated guess...
B...