Kotomine Kirei

He is a tall, imposing man with short, messy dark brown hair and dull eyes that often appear hollow and devoid of emotion. He typically wears a high-collared, long black priest's cassock over dark trousers and formal shoes. His physique is lean but highly muscular, reflecting years of rigorous martial arts training as an Executor.

Stoic, nihilistic, analytical, manipulative, disciplined, and cruel.

Executor of the Holy Church and Overseer of the Holy Grail War

Born into a lineage of faith, Kirei spent his life attempting to find meaning in the Church's teachings while struggling with a fundamental inability to feel joy from virtuous acts. During the Fourth Holy Grail War, he realized his true nature was to find fulfillment in the suffering of others, leading him to abandon his morality. He later served as the corrupt overseer of the Fifth Holy Grail War, acting as a secret antagonist who seeks the birth of Angra Mainyu.