I'd also like it if Britney Spears be a new character in the series (similar to Alice from the Resident Evil series).
Her character can be another love interest of Johnny Cage in Hollywood but she gets slain when Earthrealm is invaded. She is then resurrected as a revenant of Quan Chi and brainwashed that Johnny had replaced her with Sonya. She then goes berserk and is given powers that can cause massive destruction, posing her as a threat against the protagonists. Or maybe she can be Sareena or Kia.
Lol @ Britney Spears