Emperor Mateus/Other appearances

Ivalice Alliance
The Esper Mateus from Final Fantasy XII is named after, and based on, the Emperor, its appearance resembling the Emperor's armor. The Esper's back story is based on his command of hell. The Totema Mateus from Final Fantasy Tactics Advance is also named after the Emperor, but that is where the similarities end.

Dissidia Final Fantasy
The Emperor of Palamecia appears as a Warrior of Chaos and he stands as the antagonist representing Final Fantasy II, opposing Firion.

As one of the higher-ranking villains, the Emperor is the mastermind of the game's overarching plot to destroy Cosmos and drown the world in darkness. He manipulates hero and villain alike towards this goal and it is later revealed the Emperor orchestrated the plan with the intent for both Cosmos and Chaos to die. Having manipulated Jecht into fighting Tidus when the former was a Warrior of Cosmos in a previous cycle, he has obtained a Crystal from Jecht's fighting attuned to Chaos instead of Cosmos. The Emperor's ultimate goal is for both gods to perish and their warriors with them, leaving him to survive their destruction due to the power of his Crystal and rule over existence unopposed.

His alternate outfit is a pale purple, gray and white palette swap based on his appearance in an alternate Yoshitaka Amano artwork.

Dissidia 012 Final Fantasy
The Emperor reappears as a Warrior of Chaos in the prequel to Dissidia Final Fantasy alongside all the other characters from the original. He is the one responsible for Tidus being summoned to fight Jecht, but Tidus's memories are stirred by Yuna. The Emperor attempts to kill her but Tidus protects her, leaving the Emperor to fight Yuna while Jecht tends to the wounded Tidus. During the battle Jecht transfers his light to Tidus, leaving himself an empty husk, and the Emperor enacts his plan to seize a Crystal by taking him to Chaos to be imbued with the power of discord. The Emperor later participates in the final battles, battling Yuna.

The Emperor's second alternate form is his Final Fantasy Origins appearance as seen in the Final Fantasy II opening cinematic, giving him a dark purple and black robe. As a bonus fourth outfit available for download from the PlayStation Network, the Emperor dresses in a gold and purple robe as the Emperor of Arubboth.

Theatrhythm Final Fantasy All-Star Carnival
The Emperor makes his Theatrhythm debut as an unlockable character by collecting dark crystal shards.

He is classed as a Magic-type character, and his Limit, Absolute Dominion, deals damage to boss type enemies in proportion to Magic and Strength.

Final Fantasy All the Bravest
The Emperor appears as a boss in Final Fantasy All the Bravest.

Mobius Final Fantasy
The Emperor appears as an ability card in Mobius Final Fantasy.

Final Fantasy Trading Card Game
The Emperor appears in Final Fantasy Trading Card Game with his Dissidia artwork and renders and with his Yoshitaka Amano artwork. His cards are either ice or dark-elemental.

Triple Triad
The Emperor appears on a Triple Triad card in the version available via Final Fantasy Portal App.

Puzzle & Dragons
The Emperor appeared in Puzzle and Dragons as part of the Final Fantasy Collaboration in his Dark Emperor incarnation. The collaboration event happened in the North American version of the game from 2 to 15 November, 2015.