Inspector Koichi Zenigata is a Japanese police inspector affiliated with Interpol, relentlessly dedicated to capturing the international thief Arsène Lupin III. Originally named Heiji Zenigata VII, this referenced his ancestry to the fictional detective Heiji Zenigata known for throwing coins as weapons; however, the blood relation was later deemphasized and his given name standardized as Koichi. He perfected his ancestor's concept into a signature handcuff-throwing technique. Zenigata started with the Tokyo Metropolitan Police before transferring to Interpol to pursue Lupin worldwide. *The Mystery of Mamo* briefly mentions a daughter named Toshiko, though later episodes contradict this, stating he has no family due to his singular obsession with Lupin. This obsession defines him: he considers Lupin his exclusive target and purpose, frequently ignoring other criminals or Interpol orders when Lupin is involved. Lupin's apparent death causes Zenigata profound loss of direction, leading to retirement in a monastery in *The Fuma Conspiracy*. Conversely, successful capture frustrates him, as seen in Part 1, Episode 4, where he wishes for Lupin's escape after a year-long imprisonment. Physically, Zenigata is a middle-aged man of average height with a muscular build, dark hair, and a cleft chin. His appearance varies: early designs featured red-toned skin later lightened, and *The Castle of Cagliostro* presented him as more conventionally handsome. His iconic attire is a trench coat and fedora, with colors changing per series: orange in Part 1, camel in Part 2, light green in Part 3, red in Part 4, and light brown in Part 6. Personality-wise, Zenigata balances competence and impulsiveness. Early portrayals (*Part 1*, *The Woman Called Fujiko Mine*) showed him as corrupt, violent, and opportunistic, but he evolved into a more principled, if bumbling, figure who rejects bribes and upholds justice. He exhibits intense dedication, often working alone due to Interpol's budgetary constraints or corruption. Despite a gruff demeanor, he displays vulnerability—crying when Lupin shows kindness or when assuming Lupin's death—and unexpected affection, like his gentle interaction with Clarisse in *Cagliostro*. His dynamic with Lupin is complex; sworn enemies, they share mutual respect and form temporary truces against greater threats, collaborating in *Cagliostro* to expose a counterfeiting ring. Lupin affectionately calls him "Pops," a nickname Zenigata tacitly accepts. Zenigata possesses notable physical and deductive skills, excelling in judo, karate, and marksmanship with a Colt M1911 pistol. His endurance is superhuman, recovering in *Lupin III vs. Detective Conan* from a stun gun dose meant for elephants in 30 seconds. As a detective, he reliably predicts Lupin's heists and identifies security flaws, though his "cowboy cop" tactics draw criticism. Live-action adaptations (*Inspector Zenigata*, 2017) show his adaptability to modern policing and traits like culinary enthusiasm. In *Missed by a Dollar*, Zenigata pursues Lupin targeting a ring leading to a legendary broach, fulfilling his standard role without unique developments. Across all media, Zenigata's core remains an unwavering commitment to chasing Lupin, which gives his life meaning.