Reptile

Another one of the most well known and oldest of the Mortal Kombat characters is Reptile. Reptile was in the very first Mortal Kombat game, he was a secret unlockable boss fight in the first game and became a playable character in the second game. He is the one of the few characters of Mortal Kombat to appear in all of the games. Reptile's species Saurians originates from the world of Zaterra. Reptile is the only one of his kind left in the Mortal Kombat universe because of Shao Kahn destroying his home world.
The controls for Reptile's fatality in the latest game, Mortal Kombat 9,are:

Acid Yak: Forward, Forward, Down, Up, X/ A
Weight loss: Down, Down, Forward, Back, Square/ X