Fighter ID

Dark display theme for Kyoshiro Senryo
Games
Mortal Kombat 2 / Mortal Kombat II, Mortal Kombat II: Kyūkyoku Shinken
Hidden Character Arcade
Unplayable. Not available in Game Boy, Game Gear, or Master System versions.
Digitized Actor Daniel Pesina
Mortal Kombat 3
Hidden Character Arcade
Unplayable. Unavailable in R-Zone, Tiger LCD and GameBoy versions.
Digitized Actor Rich Divizio
Ultimate Mortal Kombat 3
Hidden Character Arcade
Non-playable in Arcade, Saturn, Xbox Live Arcade, Playstation 2, and Nintendo DS versions. Initially available in Genesis and Super NES versions.
Digitized Actor John Turk
Digitized Actor Rich Divizio
Saturn version only
Mortal Kombat Trilogy
Playable Character Playstation
Hidden, unlockable character in Game.com version. Unavailable in R-Zone and Tiger LCD versions.
Digitized Actor John Turk
Mortal Kombat 4
Hidden Character Playstation
Available only in Playstation, Nintendo 64, and Windows versions (was a standard playable character in preliminary versions of the Arcade version).
After Mortal Kombat 2, Daniel Pesina (who played Johnny Cage and the male ninjas) used his Johnny Cage likeness to endorse some non-MK products including sports supplements, workout videos, and even Bloodstorm, another particularly violent fighting game. The subsequent controversy and falling out was supposedly a factor in both Johnny Cage (and the ninjas) absence in Mortal Kombat 3.
Johnny Cage
Reptile
Scorpion
Smoke (Cyborg)
Sub-Zero
The grim undead look given to Havik was originally going to be yet another new look for Noob Saibot.
Havik
For the three or four of you who haven't got it yet, Noob Saibot's name comes from the reverse of Mortal Kombat series creators Ed Boon, and John Tobias' last names.
Though his chilly persona is no more, at least as of Mortal Kombat 4, Noob could still use his ice powers to finish off an opponent.