Bio:
An Aztec-inspired warrior whose realm of Osh-Tekk was merged with Outworld. He was additionally worshipped in Earthrealm and served Mileena before overthrowing her from the Outworld throne for treason. He is currently the ruling emperor of Outworld, and wins the civil war against Mileena during the game's plot. As an Osh-Tekk, his powers originate from the sun, and is physically much stronger than humans. He can call upon sunlight to heal and strengthen himself as well as burn enemies. With Outworld relics, he can use blood magic to further strengthen his already-potent abilities. His power over sunlight is then capable of burning through storm clouds. He also uses his signature weapon, a macuahuitl, in his War God variation. He also carries other weapons, particularly a tecpatl and two sickles. His final power is teleportation via smoke and flames, although this cannot be used in-game.

In Mortal Kombat X, he is first revealed as having led Reptile and D'Vorah in a revolt against Mileena. Reptile witnessed Mileena's creation in Shang Tsung's Flesh Pits some time prior, and has decreed that her status as Shao Kahn's daughter is moot. After a battle, Mileena is forced into hiding, Ermac joins Kotal Kahn, and Baraka is killed by D'Vorah. By the present time of the game's events, the civil war in Outworld has reached its peak, with Outworld refugees migrating to Earthrealm. Cassie Cage's team is sent to assist Kotal Kahn and inform him of local events, particularly the disappearance of Shinnok's amulet and its possession in the hands of Mileena. Throughout the first half of the game, he and Cassie's team force Mileena's group into hiding and then execute Mileena, ending the civil war. However, after securing Shinnok's amulet, Kotal Kahn immediately betrays the Earthrealmers, imprisoning them and allowing D'Vorah to bring the amulet to an unspecified location for safekeeping. D'Vorah is in truth allied with Shinnok, and begins to journey towards Quan Chi, who can free Shinnok, after slaughtering the Osh-Tekk convoy sent with her. Concurrently, Takeda breaks Cassie's team out of prison, and they begin journeying back to Earthrealm. This causes confusion among the Outworlders, including Kotal Kahn, who believes the Earthrealmers and D'Vorah are allied together. He leads a vicious attack against Cassie, Jacqui, Kung Jin, and Takeda and refuses to help fight Shinnok, believing his best course of action is simply to buy more time for Outworld to survive. However, Kotal Kahn's invasion is halted when he is defeated by Jacqui. Shinnok is eventually defeated, and Kotal Kahn retreats back to Outworld.

In Mortal Kombat 11, Kotal is about to execute the Kollector before Kronika brings back most of the combatants from over 25 years ago. He allies his troops with the younger Raiden and Earthrealm to stop Kronika and the resurrected Shao Kahn who wants his throne back. It is revealed that he and Jade were romantically involved when they were younger and prior to Jade's death. Though he and his former lover team up to track down Shao Kahn, she ends up turning him over to the former Kahn when he tries to exterminate innocent Tarkatans. Kitana and her troops rally the Shokans and Tarkatans to aid him in the battle against Shao Kahn and his forces. During their battle, Shao Kahn breaks Kotal Kahn's back, leaving him unable to use his legs. Kotal names Kitana as his successor to the throne after she defeats Shao Kahn.