OVA
Description
Inspector Koichi Zenigata stands as a central figure in the franchise, primarily depicted as a dedicated Interpol officer. His life's mission focuses on apprehending the master thief Lupin III, a pursuit defining his character across iterations. Originating from Japan, he initially served with the Tokyo Metropolitan Police before transferring to Interpol to concentrate fully on capturing Lupin after their first encounter.

Zenigata's lineage traces to the fictional Japanese detective Zenigata Heiji, known for coin-throwing combat. Early iterations presented him as Heiji Zenigata VII, though this blood relation received less emphasis over time, leading to consistent use of Koichi Zenigata. His design typically portrays a middle-aged man of average height, frequently wearing a trench coat and fedora, with color schemes varying across productions. Physical attributes include a pronounced cleft chin and dark hair, sometimes styled as a flat-top or comb-over.

The character balances serious police competence with obsessive, occasionally comedic dedication to his quarry. He maintains a strong moral code, resisting bribery and demonstrating old-fashioned honor, though early portrayals depicted more ruthless and corrupt tendencies, particularly in "The Woman Called Fujiko Mine" series. Despite his singular focus on Lupin, Zenigata develops a paradoxical relationship, showing genuine concern for the thief's wellbeing and mourning when believing him dead. This dynamic establishes an unspoken understanding where neither seeks to kill the other.

Zenigata exhibits notable physical and investigative skills, including proficiency in judo and karate, marksmanship with a Colt M1911 pistol, and extraordinary accuracy in throwing handcuffs as a signature weapon. His obsession occasionally grants near-superhuman endurance, such as waking from comas or breaking restraints when motivated by the pursuit. Professionally, he invents specialized gadgets like inescapable "Zenigetcha" thumb cuffs and Lupin-detecting devices, showcasing ingenuity beyond his bumbling reputation.

Character development reveals evolution from early corrupt and violent tendencies toward greater affability and integrity. While Lupin remains his primary focus, Zenigata occasionally collaborates with him against greater threats. His personal life receives minimal exploration, with brief mentions of a daughter named Toshiko in "The Mystery of Mamo" and potential marital strain due to his obsessive career. When suspended from duty or ordered to cease pursuing Lupin, Zenigata continues his chase as a private citizen, demonstrating independence from institutional authority.

Regarding "Lupin III: Secret Files," the compilation includes the 1969 pilot film where Zenigata appears alongside Detective Kogoro Akechi as an antagonist pursuing Lupin's gang. This early portrayal features him in a more conventional detective role before later development. The pilot establishes his persistent chase but lacks the nuanced dynamic with Lupin seen in subsequent media. No substantive character development specific to Zenigata occurs exclusively within "Secret Files" beyond this introductory appearance.