Jun'ichirō Tanizaki, an 18-year-old Armed Detective Agency member, sports a slim frame, downward-swept orange hair secured by a light grey bobby pin on the left, and hazel eyes. His standard outfit includes an oversized off-white V-neck sweater with a black collar stripe over a black tank top, light blue pants, and brown shoes, often accessorized by a red sweater tied at his waist. During the Agency's terrorist framing, he wore a white hood suit and later military police riot gear with black boots and gloves. Personality-wise, Tanizaki appears among the Agency's most "average" members—less eccentric or loud than peers—yet follows assignments diligently, especially under seniors like Doppo Kunikida. He intermittently voices insecurity over his ability's combat limitations but takes pride in surviving the Agency's dangers. Generally humble and adaptable for reconnaissance, he displays nervousness in high-pressure scenarios, earning him the moniker "wimpiest in the east." His morality proves fragile: he prioritizes self-preservation and Agency safety above ethics, willing to harm civilians, deploy lethal force, or defect to the Port Mafia if necessary. This impulsiveness marks him as a potential liability. His core trait is obsessive devotion to younger sister Naomi; he responds with extreme violence to threats against her, discarding morality, ego, or pride. He openly vows to "burn the world" for her, exemplified by threatening Port Mafia commanders over her safety. Tanizaki's ability, Light Snow (細雪, Sasameyuki)—named after the real author's novel *The Makioka Sisters*—generates localized illusions, often visualized as snowfall. It excels in stealth, misdirection, and intel-gathering but falters in direct combat. Beyond this, he demonstrates cooking proficiency, particularly with dishes like Hayashi rice. He resides solely with Naomi in apartment 203—a pun on the Japanese word for "brother" (兄さん, *nii-san*)—with no known parental or early history. Before joining the Agency, he was a student. His traumatic entrance exam caused subconscious memory repression. Across key arcs, his involvement evolves: confronting Ichiyō Higuchi to shield Naomi during the Port Mafia conflict (interrupted by Ryūnosuke Akutagawa); aiding reconnaissance and combat against Guild foes like Herman Melville and John Steinbeck; adopting formal wear post-Cannibalism arc celebrations; and utilizing military gear with heightened tactical aggression when the Hunting Dogs frame the Agency, showcasing pressure-driven adaptability. Literary ties to namesake author Jun'ichirō Tanizaki (1886–1965) inform his character. The author's themes of obsession, eroticism, and illusions mirror Tanizaki's ability and Naomi bond. The novel *Naomi*—centered on a man sculpting his ideal woman—fuels theories that Naomi is his illusion or their sibling dynamic masks romance. The author's use of blindness as devotion metaphor (e.g., *A Portrait of Shunkin*) reflects Tanizaki's morality sacrifice for Naomi. The author's shift from Western fascination to Japanese tradition parallels theories of Tanizaki defecting to the Port Mafia as a thematic "return from the West." His documented earthquake aversion nods to the author's Yokohama home loss.