Character profile
Shirou Tokisada Amakusa
天草四郎時貞Shirou Kotomine (シロウ・コトミネ)
Biography
Shirou Tokisada Amakusa is the Master of Assassin of Red and is dispatched by the Church as one of the Red Faction's Masters. He intends to use the Holy Grail War to fulfill his own wish and has no connection to Shirou Emiya of the Fate/stay night timeline.
Story spoilers
Shirou is actually a Ruler-class Servant summoned by the Einzbern Master in the Third Holy Grail War. Contact with the Greater Grail allows him to receive flesh and remain materialized.
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