Kirei Kotomine
Kirei Kotomine is the main antagonist of the Fate franchise. He initially poses as Assassin's master in the Fourth Holy Grail War and forges a contract with Gilgamesh later on. He then appears as the overseer of the Fifth Holy Grail War, acting as an enemy and ally alike to Shirou Emiya, and pretends to be an impartial mediator until he reveals that he is actually the master of Lancer.
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