Daisuke Jigen is a professional marksman and thief, serving as Lupin III's primary partner. His background involves early criminal exposure, with his father taking him to battlefields and involving him in illegal transactions from a young age. By his teens, he mastered firearms, especially revolvers, and worked underground delivering weapons and protecting jewelry. He first encountered Lupin III during their youth, initially resisting friendship but gradually forming a partnership through shared adventures. His origins vary. Some accounts place his birth in the Bronx, New York, where he joined the New York mob under Joe of Spades, who taught him gun skills. He later moved to Europe, joining the Italian mafia. During this time, he became involved with Cicciolina, his boss's wife. When the boss discovered the affair and tried to kill her, Cicciolina accidentally shot him. Jigen took the blame, claiming the boss's revolver as his signature weapon, and fled to the Chinese triads. This event, combined with Cicciolina later manipulating him into killing her as assisted suicide, cemented his aversion to romance and shifted his focus to theft over contract killing. His adult encounter with Lupin III was initially adversarial. In the manga, he was hired to assassinate Lupin for 2 million yen, leading to a confrontation where neither succeeded. Despite claims of a childhood friendship, their alliance fluctuated between rivalry and partnership due to inconsistent continuity. They solidified their partnership after Jigen briefly served under King and hesitated to kill Lupin when ordered, citing their history. The anime *The Woman Called Fujiko Mine* depicts their first meeting in a pyramid; they initially tried to kill each other before collaborating to escape, agreeing to duel later. Their formal partnership began after Lupin rescued Jigen from police custody. Jigen combines cynicism, pragmatism, and loyalty. He frequently expresses irritation with Lupin's recklessness and womanizing, particularly distrusting Fujiko Mine due to her betrayals. Despite this, he remains Lupin's steadfast confidant and often acts as the voice of reason. He possesses a quick temper and retaliates violently against insults or threats. While willing to kill when necessary, he adheres to a personal code against harming women and children. His demeanor includes a dry sense of humor, and he prefers smoking Pall Mall or Marlboro cigarettes, drinking whiskey, eating American food, and watching spaghetti westerns. His skills center on firearms mastery. He achieves a 0.3-second quick draw with his Smith & Wesson Model 19 revolver, exhibiting superhuman accuracy—capable of shooting skeet with a handgun, intercepting missiles mid-flight, and deflecting bullets. He employs trick shots for non-lethal takedowns. Proficiency extends to sniper rifles, machine guns, and anti-tank weaponry. He is also adept at hand-to-hand combat, vehicle operation, and disguise. Physically, Jigen is tall and lean, often depicted with a light tan. He obscures his eyes beneath a broad-brimmed fedora, which doubles as an aiming tool, and sports a mullet hairstyle with a pointed chin curtain beard. His wardrobe consists of dark suits, light dress shirts, and flat-end ties, with minor color variations across series. The fedora remains his most consistent and prized accessory, rarely removed except during mourning or formal events. Key developments include confronting his past as a bodyguard in *Daisuke Jigen's Gravestone*, where he grappled with guilt over failing to protect Queen Malta and faced assassination attempts by the sniper Jael Okuzaki. In the *Tokyo Crisis* TV special, his chronic toothache temporarily hindered his effectiveness during a heist, though he later rejoined the team. The *Lupin Zero* ONA explored his youth, depicting his early criminal activities and burgeoning partnership with Lupin. Crossovers with *Detective Conan* revealed his role training security forces for Vespania. Jigen evolved from a morally ambiguous, backstabbing figure in early manga to a more consistently loyal partner in anime adaptations. His relationships, particularly with Lupin, deepened through shared trials, such as Lupin aiding him against adversaries like Jael Okuzaki. Despite a gruff exterior, actions like protecting civilians in *Tokyo Crisis* or honoring fallen allies in *Gravestone* underscore an underlying sense of duty and compassion.