Amakusa Shirō Tokisada, a 17th-century leader of the Shimabara Rebellion, emerges in fiction as a Ruler-class Servant shaped by the Edo period’s religious persecution and oppressive governance. His rebellion, fueled by the desperation of persecuted Christian peasants, collapsed under mass executions, culminating in his beheading. In his final moments, he yearned for redemption—a chance to forge a world absolved of suffering, haunted by the bloodshed he could not prevent. Resurrected as a Servant in a Holy Grail War, he assumes the alias Shirou Kotomine, masquerading as a mediator while covertly manipulating events to claim the Grail. His objective: enact a global spiritual metamorphosis, eradicating suffering by stripping humanity of free will. This twisted altruism arises from his conviction that humanity’s self-destructive cycles necessitate drastic intervention, rendering him an ambiguous figure straddling salvation and tyranny. His visage juxtaposes youth with weathered wisdom—tanned skin, white hair, and piercing gold eyes framed by robes blending clerical austerity with samurai motifs. Scars trace his history of conflict, each a silent testament to battles endured. Behind a veneer of serenity lies a strategist who calculates alliances and enmities with equal precision, discarding loyalty when it obstructs his vision. Interactions reveal a philosopher’s detachment; he views relationships as fleeting tools unless they align with his grand design. Even his alliance with Semiramis, forged through years of meticulous effort, remains a pact of convenience devoid of deeper sentiment. Figures like Darnic Prestone Yggdmillennia distrust his methodical ruthlessness, recognizing the peril of his centuries-spanning schemes. Amakusa’s narrative orbits the clash between martyrdom and Machiavellianism. His quest to atone for past failures manifests as a desire to impose universal peace through the Grail’s power, yet this erasure of individual agency casts his idealism into shadow. A tragic paradox, he embodies both the martyr’s selflessness and the tyrant’s hubris, eternally torn between the world he seeks to save and the freedoms he would destroy to achieve it.