Shirō Emiya emerges as the sole survivor of Fuyuki City's catastrophic fire, an event burdening him with profound survivor's guilt. Rescued and adopted by Kiritsugu Emiya, he inherits his father's ideal of becoming a "Hero of Justice" – a commitment to save others at any personal cost, rooted in the trauma of being the only one rescued. This ideal fundamentally shapes his early actions and motivations. Physically, Shirō is a teenager distinguished by auburn hair and golden-brown eyes. Throughout the Fifth Holy Grail War, he typically appears in casual attire like a blue-and-white baseball jersey and jeans, or his Homurahara Academy uniform. Within the *Heaven's Feel* narrative, his body undergoes dramatic alteration: after sustaining near-fatal injuries, Archer's left arm is grafted onto him as a replacement. This arm grants access to Archer's powers but progressively damages Shirō's mind and body with each activation due to incompatibility. Ultimately, his original body is destroyed, leading to his revival within an artificial puppet body crafted by Touko Aozaki, noted to closely resemble his original form. Shirō's personality is defined by a self-sacrificial distortion. He consistently prioritizes others' lives over his own, viewing his survival as inherently unfair compensation for those lost in the fire, leading him to routinely endanger himself and causing concern among his allies. In *Heaven's Feel*, his devotion narrows intensely toward Sakura Matō. Faced with the conflict between upholding his ideal of universal heroism or saving Sakura – who is fused with the corrupted Shadow and poses a threat – he consciously abandons his lifelong dream. He declares his love for Sakura and vows to protect her exclusively, accepting the potential for enabling her destructive power and moral compromise. This choice marks a fundamental rejection of the identity built upon Kiritsugu's ideal. Key relationships drive his development: Sakura Matō becomes his singular romantic focus in *Heaven's Feel*. Choosing her over his ideal, he protects her despite her connection to Angra Mainyu and the Shadow. He ultimately severs this link using the projected Noble Phantasm "Rule Breaker," insisting they live together to atone. Rin Tohsaka, Sakura's sister, serves as his crucial ally. They collaborate to confront Sakura and the Shadow, with Rin providing essential magical support. Shirō later depends on Rin and Touko Aozaki to transfer his soul into a new body after the Grail's destruction. Illyasviel von Einzbern is revealed as his older sister. She sacrifices herself performing the "Heaven's Feel" ritual to destroy the Holy Grail and separate Shirō's soul from his dying body, enabling his survival. Kirei Kotomine's conflict with Shirō culminates in a physical confrontation at the Grail's location. Shirō defeats Kirei, who acknowledges Shirō as the war's victor before dying. In resolution, Shirō survives through Illya's sacrifice and the intervention of Rin and Touko Aozaki. Residing within his artificial puppet body, he reunites with Sakura. Their relationship, alongside Rin, Taiga Fujimura, and the incarnated Rider, finds peace in a concluding scene beneath cherry blossoms, fulfilling a promise made earlier to Sakura.