Commander Tartar

Commander Tartar , also known as the Telephone for the majority of the game, is the main antagonist of ''Splatoon 2: Octo Expansion. ''He is an ancient A.I created by a professor to help guide future races after the inevitable wipeout of humanity, but grew to despise Octolings and Inklings alike.

Biography
He introduces himself as a friendly telephone at the beginning of the game, that guides Agent 8 through the levels of the game, leading up to the "Promised Land". However, this is nothing more than a farce, as the "Promised Land" is in fact a giant blender that Tartar seems to use to murder Octolings and use them to create the "ultimate lifeform", which he wants to create after he wipes the world out. If his labelled number for Agent 8 is any indication (10,008), then it is possible he could have blended up to ten thousand Octolings up until Agent 8 stopped his plans. This possibility is increased by the fact that he mentions Agent 8 was the test subject who came closest to stopping his maniacal plans.

Tartar is also capable of brainwashing. Before Agent 8 reached him, he had Agent 3, the playable character from the original Splatoon, infected and brainwashed to do Tartar's desires. He had him fight Agent 8 before the latter broke Agent 3 out of it. In the past, 12,000 years ago, Tartar was created by a professor who wanted to better the future and pass on the knowledge of humans. Tartar calles him brillaint at one point, but it is incredibly likely that he was programmed into caring for him. Tartar is seen to break free of his programming, such as creating his own directive (and going against his professor's will) to destroy the planet's life.

His fight is versus a giant statue of a human head he had turned into a weapon, vaguely resembling Julius Caesar. The machine was named Nils, meaning "end", rather unsubtly indicating the reason for its existence.

Personality
While disguising himself as the Telephone, he uses "cool" lingo for Agent 8. However, this is all a farce: he despises that lingo, and is a cold, calculating, murderous machine. Tartar shows no remorse for attempting genocide on the planet: he despises all living species and treats them like objects. Unlike DJ Octavio, he is a dead serious villain at all times, and his plan is on the largest scale, and wouldn't had the largest bodycount, of any Splatoon villain thus far. The repurposing of the human statue into a weapon as well as the possible manipulation of over ten thousand Octolings suggests that he is also an extremely intelligent being.

Trivia

 * Tartar is the only Splatoon boss who is not a member of a fish species.