Who can be a good guest character in Mortal Kombat on xbox 360?

Since it has to be from a game that is exclusively on xbox 360, who would fit the best? Every character I can think of is human. The closest to someone having special powers would be Shepard from M Effect, but playstation is about to get those games too. Kratos goes great with this game because he has special powers, he's ruthless and has that Mortal Kombat kind of look already. Who could a xbox 360 version of that be?