Onaga (Earth-3900)

"It was said that there was one true ruler of Outworld. That ruler has returned."

- - Shujinkō

Onaga, also known as the Dragon King, is the former ruler of Outworld, belonging to the extinct race of the Dragons. Once the greatest leader of Outworld there was, Onaga was betrayed by his own advisor, Shao Kahn, who poisoned and killed him, taking the Outworld throne for himself. Rendered long forgotten, his death predating events such as the fall of Shinnok and the forging of the Cursed Swords, Onaga actually managed to survive in a non-corporeal state by drinking of the blood of a Dragon infant.

Taking the identity of Damashi, Onaga would fool the then young Shujinkō, a Human, into searching the Kamidōgu his entire life in the hopes the ancient artifacts would ressurect him once more. After Shujinkō managed to gather the artifacts, Reptile served as the other part of his plan, which Onaga possessed to become a vessel for his return.

Personality
"You may hear me, Onaga... EMPEROR ONAGA Not anymore."

- - Shao Kahn and Onaga at a gather hours before the Battle of Armageddon