|Age||Beyond 10,000 years|
"It is said that there is only one true ruler of Outworld... and that ruler had returned."
—Mortal Kombat: Deception intro
Onaga is a dragon who ruled over the Outworld. He participated in the Game of Destiny so that he can gain the ultimate power and conquer the universe, but like all other contestants, he did not receive his wishes due to the intervention of Neo Metal Sonic.
Onaga is able to withstand many attacks before losing his powerful aura that protects him. Even then, his defense allows him to continue to battle without being defeated easily. His attacks include fire and magic.