The green ninja, Reptile!
Presenting his appearances in:
MK1 1992
MK2 1993
MK3 1995
Mortal Kombat: The Movie 1995
Mortal Kombat defenders of the realm 1996
Mortal Kombat: Conquest TV series 1998
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Syzoth, more commonly referred to as Reptile, is a character in the Mortal Kombat fighting game series. He is one of the few original characters, debuting in the original Mortal Kombat arcade game as a secret character. He made his playable debut in Mortal Kombat II.
Since his debut, Reptile has been a well known servant to the Outworld Empire, faithfully serving the Outworld Emperors Shao Kahn and Kotal Kahn while remaining loyal to his master Shang Tsung.
Reptile is a green garbed, humanoid reptilian creature that embodies the archetype of the unhappy underling. Said to be physically hideous and repulsive, he is renowned for his great stealth and unquestioning loyalty. Unlike many other henchmen, Reptile does not strive for power, nor is he inherently evil. He is caught in a delusional state of mind, obsessed with finding the last remaining member of his race, or freeing his homeworld of Zaterra from Outworld's grasp. Thus, he always remains loyal to Shao Kahn, only obeying other masters to survive and reach his goal of returning Zaterra to its former glory. While well-meaning and sincere, his obsession is so important to him that it causes him temporary fits of insanity. After Shao Kahn's death, his allegiance switches to over to Kotal Kahn, helping him to claim the throne from Mileena, whose rule he is displeased with.
Reptile was hidden in the first Mortal Kombat game and thus holds the distinction of being the very first secret character to appear in a versus fighting game. Before battles with an opponent he would make his appearance and jump in the middle of the screen in a Sub-Zero win pose. Above his head would be clues on how to find him, such as "Look to la luna" ("the moon" in Spanish or Italian and hinting The Pit stage), "Alone is how to find me" (denoting that he is only unlockable in single player mode), "Perfection is the key" (directing towards the double Flawless victory), or "Tip eht fo mottob" ("Bottom of The Pit" spelled backward). Once in a while he will say "I am Reptile, find me!". This concept was repeated with Smoke and Jade in Mortal Kombat II and Khameleon in Mortal Kombat Trilogy.
He was a merge between the original Sub-Zero and Scorpion characters, capable of using both of their moves. Mortal Kombat co-creators John Tobias and Ed Boon admitted in an interview that the "birth" of Reptile was when they took Sub-Zero and Scorpion and fused the two into one and colored him green (yellow + blue = green). They christened this character "Reptile" due to his green color and their reference to lizards. While he wasn't given a lot of character depth at the time, he was worked on before the release of Mortal Kombat II. Reptile returned for the second tournament with his own special moves, available from the outset.
It is not quite clear how old Reptile is. Estimates run in the tens of thousands of years or even millions. What is known, however, is that the Earthrealm was nearly destroyed by a battle between the gods millions of years ago. Reptile's race of Raptors, or Saurians, escaped to another realm, Zaterra, where it was then invaded and annexed by Outworld's emperor, Shao Kahn. As was the usual process for Kahn conquering another world, most of the Zaterrans were killed in the ensuing battles, only leaving a handful of people left. Among those, or among those descended from these survivors, was Reptile. Unlike the others of his kind, who were forced into slavery, Reptile was trained to be a servant of both Shao Kahn and Shang Tsung.

The green ninja, Reptile!
https://www.youtube.com/watch?v=lHSz6cKmUFA&t=3s
The green ninja, Reptile!
https://www.youtube.com/watch?v=lHSz6cKmUFA&t=3s