Ritsuka Fujimaru stands as the central protagonist in the Fate/Grand Order narrative, including the Final Singularity - Grand Temple of Time: Solomon. An ordinary civilian without prior magecraft training or combat experience, they joined Chaldea Security Organization after responding to a recruitment flyer at a train station, initially serving as a minor candidate to bolster numbers. This lack of notable lineage or exceptional talent positioned them as an underdog among Chaldea's personnel. During junior high, Ritsuka befriended a reclusive World War II veteran neighbor. The veteran's perspective on finding meaning in life despite isolation and lack of recognition profoundly influenced Ritsuka, establishing their foundational belief in valuing existence irrespective of external rewards. Their high school years included participation in a volleyball team, placing them around 16-17 years old during the 2015 Chaldea incidents. Physical appearance varies by gender selection. The male version exhibits an average build with short black hair, blue eyes, and visible musculature. The female version has a side ponytail with red hair, light orange eyes, and a yellow hairband. Both versions display Command Spells on their right hand, with distinct designs per gender. They utilize numerous Mystic Codes—specialized magical outfits—including the Chaldea Combat Uniform, Arctic Region Chaldea Uniform, and the Solomon-specific "Fifth True Theoretical Factor Environment Purpose Chaldea Uniform". Ritsuka's personality aligns as Neutral Good, though antagonists like the Lion King describe them as "knowing good but committing evil, and allowing evil while being good." James Moriarty similarly notes their capacity to endure evil while pursuing good. Key traits include exceptional empathy, composure under extreme stress, and a unique ability to form respectful bonds with morally ambiguous or dangerous Servants. Early missions demonstrated calmness when superiors panicked, and Servants like Vlad III later commended their tactical aptitude. Mash Kyrielight defines Ritsuka as embodying ideal humanity: an average person persistently striving without harming others. This contrasts with traditional mage pride, as noted by Sasaki Kojirou. Adaptations depict escalating emotional strain, particularly after Olga Marie Animusphere's death and the Lostbelt saga's moral compromises. The Russian Lostbelt notably induced paralysis over sacrificing alternate timelines, mitigated only by Patxi's sacrificial intervention. Magical abilities remain rudimentary, comparable to Lord El-Melloi II. Primary strengths involve forming and sustaining hundreds of simultaneous Servant contracts—far exceeding normal limits—and utilizing Mystic Codes for basic spells like Gandr. Notable resistances include immunity to poison below Noble Phantasm-level toxicity and Suzuka Gozen's Mystic Eyes, though they remain vulnerable to divine-level charm effects like Euryale's and mental invasions via dreams. Specialized training includes ninjutsu from Fuuma Kotarou, enabling substitution techniques. In the Solomon Singularity, Ritsuka employs a unique Mystic Code designed by Leonardo da Vinci. This outfit converts their nervous system into temporary Magic Circuits, enabling seven Servant summons despite causing significant physical strain. Against Goetia, Ritsuka overclocks this system into a "Zwei Form," removing summoning limits while risking severe internal damage. This state summons key allies like Edmond Dantès and coordinates the final assault after Solomon's Ars Nova weakens Goetia. Critical moments include Mash Kyrielight's sacrificial protection against Ars Almadel Salomonis and her subsequent revival by Fou's self-sacrifice. The confrontation culminates in a physically depleted Ritsuka battling Goetia directly after Servants are unsummoned. Their rejection of Goetia's nihilism—framed as affirming life's value beyond mere survival—triggers Goetia's transformation into the King of Men for a final fistfight. Character development spans media: Early composure gives way to visible trauma in Babylonia flashbacks and profound moral conflict during the Lostbelt arc. Ordeal Call narratives further explore their psychological resilience, notably rejecting Avenger-class vengeance despite enduring suffering orchestrated by Goetia, Chaldea, and the Foreign God.