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Inspector Zenigata, whose full name is Koichi Zenigata, is a dedicated police officer of Japanese origin who serves as a field agent for the International Criminal Police Organization. He is a direct descendant of the famed fictional detective Heiji Zenigata, a lineage that influences his strong sense of duty and his unique methods. Before joining Interpol, he was an inspector with the Tokyo Metropolitan Police, but his relentless pursuit of the master thief Arsène Lupin III eventually led him to transfer to the international agency for the sole purpose of capturing his quarry. Physically, Zenigata is a muscular and square-jawed man with a ruddy complexion, standing approximately 181 centimeters tall. His appearance in The Castle of Cagliostro is notably more handsome compared to other interpretations, and he wears a brown suit with green pants and a red tie. During his investigation of the castle, he is seen carrying a jutte, a traditional Japanese truncheon, which serves as an echo of his ancestor’s signature weapon.

Zenigata possesses a complex personality that balances professional competence with an obsessive, almost impulsive temperament. He is a man of strong traditional values and deep patriotism, as shown when he prays for the soul of a deceased Japanese spy whose writing he discovers in the catacombs of Cagliostro. While he can be hot-headed and easily frustrated, especially in his interactions with Lupin, he makes a conscious effort to remain professional in the face of rude and condescending treatment from his adversaries, such as Count Cagliostro and his henchman Gustav. His drive to arrest Lupin is not merely a job but the singular motivation of his life; he has dedicated his entire being to this pursuit, often at the expense of his personal life, which remains largely unexplored and lonely. Despite his relentless pursuit, he is fundamentally a just man who respects evidence and is moved by the suffering of others. This devotion manifests as a unique, unspoken bond with Lupin. He would be devastated if anyone else were to capture or kill the thief, as he believes that right belongs to him alone, and on occasions when he believes Lupin to be dead, he has fallen into despair or even retired from police work.

In the story of The Castle of Cagliostro, Zenigata is summoned to the Duchy of Cagliostro after a notice is received that Lupin will steal something from the Count. Upon arrival, he finds Count Cagliostro to be politically powerful and obstructive, and he is quickly dismissed from the case by his own superiors who are wary of the Count's influence. His role becomes more crucial when he is inadvertently dropped into the castle's secret catacombs, where he reunites with Lupin. Trapped together, they form an uneasy truce to escape, culminating in a dramatic flight using the Count’s autogyro, which Zenigata famously struggles to pilot. After escaping, he is despondent over his inability to act, until he receives a tip from Fujiko Mine about Lupin's plan to infiltrate Clarisse's wedding to the Count. He then leads a police squad into the castle, putting on a theatrical performance to "discover" the Count's illegal counterfeiting operation, thereby providing the indisputable evidence needed to dismantle the criminal empire. Throughout the film, Zenigata serves as both an adversary and, when the situation demands, an unlikely ally to Lupin’s gang in the pursuit of a greater injustice.

His most significant relationship is, of course, with Arsène Lupin III, whom he affectionately and relentlessly refers to as "Lupin" while often being called "Pops" in return. Their relationship is one of rivalry, grudging respect, and a deep, unspoken understanding. In the film, he reluctantly accepts a truce with Lupin to survive the catacombs and later shows genuine concern when Lupin is shot, hoping the thief does not die before he can arrest him. He also works in concert with Fujiko Mine, despite her being a known criminal, because her goal of exposing the Count aligns with his own sense of justice. His interactions with Count Cagliostro and his bodyguard Gustav are defined by the Count's racism and condescension, which Zenigata endures with professional restraint until he has the evidence to act. Even in his brief encounter with Clarisse, he shows courtesy and pity, recognizing her as an innocent victim.

While Zenigata is a highly capable officer, his character in The Castle of Cagliostro shows a specific form of personal development, primarily in his ability to leverage his supposed powerlessness into a tactical victory. He uses his public dismissal from the case as cover, and later stages his triumphant discovery of the counterfeiting press not just as a police raid, but as a performance for the world to see, ensuring the Count cannot use his political connections to escape justice. This demonstrates a shrewd understanding of how to wield institutional authority and public exposure when direct action is impossible.

Zenigata is exceptionally skilled in a number of areas that make him a formidable opponent. He is a master of hand-to-hand combat, proficient in judo and karate, and is strong enough to fight evenly with the Count's massive bodyguard, Gustav. His marksmanship with his signature Colt M1911 pistol is highly accurate, though he rarely shoots to kill. His most unique and notable ability is his skill with a pair of handcuffs, which he can throw with unerring accuracy like a bola or a cowboy's lasso, often returning to him like a boomerang. He also possesses a remarkable level of endurance and willpower, surviving the fall into the catacombs and the subsequent fight without complaint. Most importantly, he is a competent detective with sharp instincts and insight, capable of deducing Lupin's presence and uncovering the security flaws of a place as formidable as Cagliostro Castle, even if he is often one step behind the thief.