Originally Posted by
Goggindowner
Cannonball - late 90's costume when he joined the X-Men. 1997 or 1998. Around the time of the Onslaught story.
Gambit - looks like Ultimate Gambit and then a recolored version of Ultimate Gambit. If memory serves, that costume was cobbled together specifically for this game.
Colossus - I think that may be a throw back to the X-Men Legends (the first one) when the X-Men had to free Professor X from Shadow King. This looks like the "Shadow Colossus" model, but I'm not sure.
Sunfire - pretty sure this one was made specifically for this game, as well. It's the only place I've ever seen this.
Toad - that is Ultimate Toad.
Scarlet Witch - that looks like her original costume when she debuted in X-Men #2 or #3 way way back in the 60's. Minus the cape she originally had.
Cable - looks like his costume from his first solo series. Mid 90's I think.