TV-Series
Description
Inspecteur Koichi Zenigata is a dedicated law enforcement officer who serves as a primary antagonist and persistent foil to the master thief Arsène Lupin III. His professional background began with the Tokyo Metropolitan Police, but his career path changed irrevocably after an encounter with Lupin, leading him to transfer to the International Criminal Police Organization to pursue the thief on a global scale. Within the world of Lupin III: Part IV, Zenigata is presented as a middle-aged Japanese man of average height with a solid, muscular build. His signature look consists of a red trench coat, a brown fedora, a tan suit, a white shirt, and a charcoal gray tie, which distinguishes him from his appearances in other parts of the franchise. For this series, his design was altered to make him appear younger and more handsome, taking influence from his original manga depiction where he is not much older than Lupin himself.

The personality of Inspecteur Zenigata is a study in contradictions, balancing sharp professional competence with an obsessive, often bumbling single-mindedness. In Part IV, his characterization strikes a balance between the stern, serious officer seen in earlier media and the more comically overzealous chaser from later series. At his core, he possesses an unwavering, old-fashioned sense of justice and honor that makes him highly resistant to bribery or corruption, a trait that often puts him at odds with more cynical superiors or criminals. Despite his authority, he is emotionally sensitive and prone to impulsive acts driven by his obsession. His famous, thunderous shout of "LUPIN!" is a hallmark of his character, yet he is also known to weep openly during moments of perceived kindness from his quarry or out of relief when he believes Lupin has survived a dangerous situation. While on the job he is relentless, off-duty he exhibits famously messy habits, leaving his hotel rooms and office desks in states of chaotic disarray, and he may indulge in depressive binges involving large quantities of food or alcohol when frustrated or suspended from duty.

Zenigata's primary motivation is, to an almost existential degree, the capture of Arsène Lupin III. This is not merely a professional goal but has become the central purpose of his life. He believes that only he has the right to capture Lupin, and the thought of anyone else succeeding, or worse, killing the thief, is deeply troubling to him. His role in the story is to act as the relentless pursuer who is perpetually one step behind, yet always present. He often serves as a catalyst for plot progression, as his appearances force Lupin to adapt and move, but he also functions as an unlikely ally. When a greater threat emerges, Zenigata frequently sets aside his personal vendetta to cooperate with Lupin, demonstrating a pragmatic understanding that some criminals are worse than the gentleman thief he chases.

The key relationship that defines Koichi Zenigata is his complex, decades-long dynamic with Arsène Lupin III. While they are sworn enemies on a legal and professional level, a deep, unspoken mutual respect and even affection has developed between them. Lupin affectionately refers to Zenigata by the nickname "Pops," a term the inspector secretly tolerates. Their rivalry is often compared to a human version of Tom and Jerry, with the understanding that neither character can truly have a final victory over the other without ending both narratives. A unique, unwritten rule generally forbids the use of lethal force between them; Zenigata aims to arrest, and Lupin aims to escape. This bond is most evident when one appears to be in mortal danger. Zenigata has been known to become deeply depressed or even retire to a monastery if he believes Lupin is dead, while Lupin will go to great lengths to avenge Zenigata if anyone else tries to harm him. This unusual friendship is so intense that other characters sometimes misinterpret it, as seen in Part IV when a character assumed Zenigata was Lupin's jealous ex-boyfriend after he crashed a wedding ceremony.

While Zenigata's core traits remain consistent, his character in Part IV reflects a development toward a more balanced and competent portrayal compared to some of his more bumbling incarnations in earlier decades. His abilities are formidable and often underestimated due to his obsessive focus on Lupin. He is a master of judo, karate, and jitte combat, capable of subduing multiple attackers with ease. His signature weapon is a pair of handcuffs, which he can throw with superhuman accuracy, often attached to a rope to ensnare targets like a bola. He is also a proficient marksman with his Colt M1911 pistol. Beyond physical prowess, Zenigata is a skilled detective and inventor, creating specialized gadgets such as unpickable thumbcuffs and even a metal detector designed to beep when Lupin is near. His obsession grants him an almost superhuman level of endurance and strength, allowing him to perform feats like recovering from a powerful stun gun shock in a fraction of the time a normal person would require. This relentless dedication ensures that, regardless of how many times he fails, Inspecteur Koichi Zenigata remains a worthy and persistent rival to the world's most wanted thief.