Koichi Zenigata, universally known as Inspector Zenigata, is a central figure in Lupin III: The Last Job. His background identifies him as an Interpol inspector who has devoted his life to a single mission: the capture of the master thief Arsene Lupin III. A descendant of the legendary Edo-period detective Zenigata Heiji, he originally served with the Tokyo Metropolitan Police before transferring to the international organization specifically to pursue Lupin. In this story, he becomes involved when Lupin sets his sights on stealing a Japanese cultural treasure known as the Jigoku Nyorai Zo, a relic hidden within the recreation facilities of Nazi Germany, which is also targeted by a rival ninja thief gang led by the mysterious figure Morgana. His personality is a distinct blend of relentless, obsessive dedication and deep emotional sensitivity. He is an incredibly skilled detective capable of tracking Lupin across the globe and predicting his schemes, yet his single-minded focus often makes him appear bumbling and easily manipulated by the thief's misdirection. He is prone to intense emotional outbursts, frequently weeping in frustration, relief, or sentimental attachment when his pursuit of Lupin takes a surprising turn. His core motivation is not merely professional duty but a deeply personal crusade. He believes that only he has the right and the ability to arrest Lupin, making the chase the singular driving purpose of his existence. His role in the narrative is that of the primary foil and antagonist, providing the engine for the action and the comedic tension of the heist. He represents the force of order and justice in a world of flamboyant crime. The key relationship in his life is his complex dynamic with Lupin. It is a rivalry built on grudging mutual respect and an unspoken bond, where they sometimes find themselves forced to cooperate against a greater evil, yet Zenigata outwardly refuses to acknowledge any friendship. He views Lupin's associates, such as Daisuke Jigen and Goemon Ishikawa, as secondary targets. Throughout the special, his development highlights his unyielding spirit; despite never permanently securing Lupin, his resolve never wavers, showcasing a character whose identity is entirely forged by the eternal pursuit. His notable abilities extend beyond his detective work. He is highly proficient in martial arts and hand-to-hand combat. His signature technique involves a pair of handcuffs connected to a long rope, which he throws with uncanny accuracy to apprehend criminals from a distance. He also carries a Colt M1911 pistol and possesses an almost superhuman level of endurance and tenacity that allows him to endure vast physical punishment and obstacles in his relentless chase.