Shirō Emiya, a parallel incarnation from Miyu’s world, stands as the steadfast guardian of his foster sister. Orphaned during a city-wide fire triggered by the Fourth Holy Grail War’s aftermath, he was rescued and trained in magecraft by Kiritsugu Emiya, developing unparalleled proficiency—including precise Magic Circuit activation—that eclipses other versions. After Kiritsugu’s death, he dedicates himself to shielding Miyu, enforcing stringent measures like a protective bounded field and homeschooling to isolate her from external dangers. His appearance bears auburn hair streaked with white and irregular tanned patches, physical markers of prolonged Archer Class Card usage and EMIYA’s creeping influence. Activating the Archer Card alters his attire to mirror EMIYA’s, complete with a red headband and a sleeveless right arm—transformations that fade post-use but leave lasting traces of strain. Driven by an unyielding vow to safeguard Miyu, he defiantly rejects the Ainsworths’ demand to sacrifice her for humanity’s salvation. This devotion manifests in daily acts of care: gifting books, imparting life skills, and vigilantly securing her welfare. Torn between Kiritsugu’s ideal of a “Hero of Justice” and the ethical weight of valuing one life over global survival, his resolve hardens after witnessing Sakura’s death—a loss that cements his choice to prioritize Miyu, regardless of consequence. His dynamic with Julian Ainsworth shifts from casual high school rapport to bitter enmity as their ideologies collide over Miyu’s destiny. Julian’s orchestration of Fuyuki’s shadow crisis and erasure of Miyu’s lineage propels Shirō into direct conflict with the Ainsworths. Contracting Saber during the Fifth Holy Grail War, he battles to avert disasters while wrestling with the fear of mirroring EMIYA’s ruthlessness. His demeanor oscillates between sardonic humor and guilt-fueled urgency as casualties mount. Later imprisoned by the Ainsworths to manipulate Miyu, he engineers her escape to another realm before rejoining the fray. Confronting foes like Angelica Ainsworth with reinforced weapons and archery, he endures EMIYA’s encroaching influence—evidenced by fleeting skin-tone inversion—as both body and psyche fray. His arc culminates in embracing moral gray areas, symbolizing the price of defying cosmic scales for a single cherished bond.