Yukichi Fukuzawa commands the Armed Detective Agency as its president. He bears long silver hair, metallic blue eyes, and a perpetually stern expression marked by visible under-eye wrinkles or bags. His signature attire features a green yukata layered beneath a black haori edged with gold zigzags, worn with zori sandals and white tabi socks. In his youth, he sported shorter hair and dressed in a black hakama, kimono, and longer haori. Fukuzawa embodies a reserved and disciplined nature, fiercely prioritizing Yokohama's safety and his subordinates' welfare. His unwavering commitment manifests in actions like halting all agency operations to rescue Atsushi Nakajima. Despite his stoicism, he possesses a soft spot for cute things—instantly hiring Kyōka Izumi after a "cute face"—and habitually carries cat treats in his sleeves to feed strays, a detail observed by figures like Mori. He inspires deep respect and occasional intimidation within the agency, yet trusts his members' capabilities in critical moments. His ability, *All Men Are Equal* (*Hito no Ue ni Hito o Tsukurazu*), suppresses and stabilizes the powers of agency members who pass the entrance exam—a high-stakes assessment of their alignment with agency values. This precise control proves vital for members like Atsushi and Kyōka who initially struggled with their abilities. The ability also grants Fukuzawa heightened awareness of his subordinates' conditions, sensing their vital status during crises. Awakened after meeting Ranpo Edogawa, this power solidified Fukuzawa's confidence as a leader. A master martial artist and swordsman, Fukuzawa trained at a government martial arts school. He excels in techniques including *kote gaeshi*, *seoi nage*, iaido, *shukuchi*, and *muto dori*. As one of the elite government assassins known as the *Goken*, he targeted war hawks and foreign military leaders during the Great War, earning the moniker "Silver Wolf." He abandoned this role upon realizing he relished killing, transitioning to freelance bodyguard work. His background includes a formative partnership with Ranpo. After losing a bodyguarding job, they collaborated on detective cases, gaining Yokohama notoriety. To protect Ranpo—who believed he possessed a supernatural deduction ability—Fukuzawa fabricated the existence of his own power, preserving the younger man's worldview. This lie later inspired the agency's founding under Sōseki Natsume's guidance, creating a sanctuary for ability users to protect the vulnerable. Fukuzawa shares a complex history with childhood friend Ōchi Fukuchi. Once martial arts rivals, their bond fractured over ideology: Fukuchi embraced militarism while Fukuzawa pursued peace. During their reunion, Fukuzawa criticized Fukuchi's leadership, asserting his own superiority despite its decline. Their conflict culminated in battles where Fukuzawa prioritized Yokohama's stability over personal ties, even when infected with the Cannibalism virus. The character draws thematic inspiration from the historical Fukuzawa Yukichi, a Meiji-era philosopher advocating equality and education. The ability's name references his work *An Encouragement of Learning*, mirroring the agency's role as a refuge for societal outcasts.