Junichirō Tanizaki, a reserved member of the Armed Detective Agency, dedicates himself to shielding his adoptive sister Naomi above all else. His striking red hair, parted neatly and secured by a silver hairpin on the left, frames brown eyes set against pale skin. Layered outfits define his casual style—striped black shirts beneath V-neck sweaters, a red sweater knotted at his waist, and gray trousers. When circumstances demand, he swaps this for tailored suits or tactical gear, adapting seamlessly to danger.

Beneath his humble exterior lies a capacity for ruthless violence triggered by threats to Naomi’s safety. He willingly discards morality to protect her, endangering allies or colluding with enemies if survival demands it. Yet he maintains camaraderie with peers like Atsushi Nakajima, collaborating effectively on missions despite occasional nervousness under pressure.

His ability, *Light Snow* (*Sasame Yuki*), conjures illusions from snowflake-like particles to disorient foes, its name echoing the themes of familial bonds in the real Tanizaki’s novel *The Makioka Sisters*—a subtle nod to his own protective dynamic with Naomi.

Orphaned and independent, he shares a home with Naomi, their parents unmentioned. His past includes a harrowing entrance exam to join the agency, its lingering trauma buried but underscoring the resilience that defines his role.

Interpersonal ties reveal admiration for Nagai Kafū, marked by mutual respect tinged with near-obsessive devotion. His loyalty to Naomi blurs sibling boundaries, her provocations fueling speculation of romantic undertones. This bond drives his moral compromises, including alliances with adversaries during crises.

Pragmatism shapes his evolution, seen in shifts from civilian wear to military attire during conflicts. A fear of earthquakes—a quiet homage to his real-world namesake’s trauma—hints at vulnerabilities beneath his adaptability.

No details exist regarding his presence in spin-offs or media beyond the main series and *Bungo and Alchemist*.