Daisuke Jigen is a professional thief and master marksman, serving as the primary ally to Arsène Lupin III. His origins are ambiguous, though some accounts place his birth in the Bronx, New York, where he entered the criminal underworld young. He later moved to Europe, joining the Italian Mafia. There, he developed a close relationship with Cicciolina, his boss's wife. When the boss discovered this and tried to kill Jigen, Cicciolina intervened and accidentally shot her husband. Arriving at the scene, Jigen took the weapon—a Smith & Wesson Model 19 revolver—and claimed responsibility for the killing to protect her. Forced to flee the Mafia, he eventually worked for rival Chinese triads. Later, Fujiko Mine arranged a meeting where Cicciolina confronted Jigen in a church; he shot her, only to find her gun unloaded—she had intended for him to assist in her suicide. This event profoundly affected him, leading him to abandon contract killing for theft and cementing his deep distrust of women and romantic relationships, particularly regarding Fujiko Mine. Jigen partnered with Lupin III, their first joint heist a bank robbery. Their partnership solidified into a steadfast friendship, with Jigen acting as Lupin's pragmatic right-hand man and voice of reason. Despite frequent irritation at Lupin's impulsiveness and romantic entanglements, Jigen displays unwavering loyalty. He is often depicted as Lupin's closest confidant, though early manga portrayed him as a cynical opportunist willing to betray Lupin for profit. This inconsistency stemmed from the manga's lack of continuous chronology, though later adaptations solidified his role as a reliable partner. Physically, Jigen is lean with an unkempt chin curtain beard and a signature broad-brimmed fedora he rarely removes except during formal occasions or mourning; the hat also aids his marksmanship. He wears dark suits, light dress shirts, and flat-end ties, often with a bent cigarette—Pall Mall or Marlboro brands. He smokes heavily, estimated at 60 cigarettes daily, and drinks Scotch, bourbon, or beer with high tolerance. His habits include a reluctance to socialize, a fondness for American cuisine like steak and hamburgers, and an aversion to dental care—a recurring source of comedic or plot-driven discomfort. As a gunman, Jigen possesses near-superhuman skill, capable of a 0.3-second quick-draw and achieving improbable feats like shooting down missiles or deflecting bullets. His preferred firearm remains the Smith & Wesson Model 19 revolver from Cicciolina's husband, though he is proficient with rifles, machine guns, and anti-tank weapons. He employs creative non-lethal tactics, such as using gunfire to dislodge objects onto opponents. While avoiding killing women and children, he is ruthless toward threatening adversaries, viewing lethal force as professional necessity. His combat prowess extends to hand-to-hand confrontations, where he can incapacitate opponents with single strikes, and he is adept at vehicle operation, disguise, and multilingual communication. Jigen's character explores emotional vulnerability beneath his gruff exterior. Episodes like "The Face of Goodbye at the National Border" depict fleeting romantic connections revealing underlying kindness. In the 2023 film *Jigen Daisuke*, he forms a protective bond with Oto, a mute girl targeted by criminals, revealing a paternal dimension. This contrasts with his typical lone-wolf demeanor, showing growth through reluctant guardianship. Narratives like "A 7.62MM Mirage" and "The Combat Magnum Scattered in the Wasteland" delve into traumatic past encounters with mercenaries, emphasizing loyalty and retribution. His resilience is tested in *Gravestone of Daisuke Jigen*, where he survives a sniper's headshot, confronts the assassin Yael Okuzaki, and spares his life after ending his marksman career—a decision reflecting Jigen's complex morality. Jigen's background includes references to a sister and a brother killed by a man named Kido, though these details appear exclusively in early manga without elaboration in later adaptations. The prequel series *Lupin Zero* implies a childhood association with Lupin in 1960s Japan, though its canonical status remains unconfirmed.