Dragon

Little is known about the Dragons of Mortal Kombat, as only one, Onaga, has ever been shown. Onaga was proclaimed the Dragon King, although it is unknown whether he was given this title by his elusive brethren or whether it is self-proclaimed.

As Onaga is the only Dragon shown, little is known about the species, but based on The Dragon King's features, it is assumed that Dragons have a natural resistance to magic, (as whenever magic projectiles are used against Onaga they fail completely) and have super human strength. Onaga is able to raise the dead with a power given to him by his heart, and has made his army allegedly undefeatable because he continuously revives them when they are slain. This army was later uncovered by Quan Chi, and was used as the weapon of the Deadly Alliance. Although it is unknown where they originate from, the most likely place is Outworld. Dragons all lay eggs, and apparent from Onaga, even the males do. As there is little other trace of any other Dragons in the Mortal Kombat universe, it is possible that most of them were wiped out, similar to Cryomancers or the Saurians.

In Mortal Kombat: Armageddon, there are two creatures (resembling Chinese Dragons, and with the ability to breathe fire and open portals to other realms) said to be dragons guarding and aiding the game's protagonist and antagonist, Taven and Daegon. How these dragons, Orin and Caro, are related to Onaga or his own race of dragons is unknown. However, the game's "Kreate a Fighter" mode includes pieces reminiscent of Onaga's species.