TV-Series
Description
In Lupin III: Part III, the character Oscar is Daisuke Jigen, the marksman and longtime partner of master thief Lupin III. He is a calm and professional gunman who appears at Lupin's side more often than any other member of the crew, serving as his right-hand man, aide-de-camp, and closest friend within the group.

His background is only partly explained. He is believed to have once worked as a bodyguard and assassin for American criminal organizations, and one commonly told account holds that he was an American mobster who fled to Japan, adopted a Japanese identity, and took the name Jigen. By the time of Part III, he has fully committed himself to life as Lupin's partner, and the anime portrays him as extremely loyal and always willing to join whatever scheme Lupin has devised.

In personality, Jigen is the most pragmatic member of the group. He has a gruff and cynical demeanor shaped by a history of failed romances, and he is quick to lose his temper when insulted, sometimes even striking friends such as Lupin or Goemon over comical criticism. Beneath this rough exterior, he has an ironic sense of humor and genuinely enjoys the work. He often acts as the big brother and voice of reason, trying to keep Lupin focused and pointing out the risks of impulsive plans, although he has long accepted that he will inevitably be dragged into outrageous situations anyway.

His motivations center on professionalism and loyalty. He is not driven by grand idealism; rather, he values doing the job well and standing by his partner. He is consistently suspicious of Fujiko Mine and becomes irritated whenever Lupin follows one of her schemes, since her loyalties tend to shift. With Goemon, he shares a working partnership marked by occasional friction. His role in the story is to provide fire support, cover escape routes, and act as the practical counterweight to Lupin's flamboyance.

Jigen's most notable abilities are his shooting skills. He can draw and fire in about 0.3 seconds and possesses remarkable accuracy, able to hit clay targets with a handgun, destroy an incoming missile by striking its warhead, or deflect a bullet in mid-flight with his own shot. His weapon of choice is a Smith & Wesson Model 19 revolver, though he is also proficient with machine guns, sniper rifles, and anti-tank rifles. He favors clever trick shots that avoid killing, such as shooting objects loose to drop on enemies, but he is more willing to use deadly force than other members of the group when a threat demands it. He is also a skilled driver, pilot, and hand-to-hand fighter, and he is capable of using disguises.

In terms of development, Part III presents a Jigen whose appearance was adjusted to be closer to the original manga design, with a lighter-colored suit and a hatband featuring a crosshatched or grid pattern. His overall character, however, remains consistent: a dependable and sharp-eyed gunman whose broad-brimmed hat, resting low over his eyes, is as much a part of his identity as his revolver.