Chameleon

Chameleon appeared only in the PlayStation, Sega Saturn, and PC versions of Mortal Kombat Trilogy. On the Nintendo 64 version, he is replaced by Khameleon, a female version. There is little information about Chameleon. He has the appearance of a male ninja with partial transparency, and he has no backstory, or game ending. All that is known about him is garnered from the hidden option to fight him (available upon beating the game). He is referred to as "one of Shao Kahn's deadliest warriors". He is playable, but only by selecting one of the other seven male palette-swapped ninjas (Rain (purple), Reptile (green), Noob Saibot (black), Original Sub-Zero (blue), Ermac (red), Scorpion (yellow), or Human Smoke (grey) and holding a certain combination of buttons. This combination is "Away"+"High punch"+"High kick"+"Block"+"Run" regardless of platform. The character then becomes Chameleon, and switches between the seven ninjas randomly. Upon winning, Chameleon will flash through all seven colors rapidly during his victory pose.

Chameleon may be part of the Saurian (aka Raptor) race, of which Reptile and Khameleon are members, but this has never been conclusively stated in any game, and is purely speculation on the part of the fans at this point. If in fact he is a Saurian, that would mean that Reptile is not the last living male of his species, as is thought to be the case.

Chameleon is similar to Reptile's first Mortal Kombat form, in that he has no moves of his own, but rather has the moves of the ninja he is emulating. Where Reptile was named for being green, Chameleon was named for his color changing and camouflaging, similar to a real chameleon.