Lupin III, the world-renowned gentleman thief and grandson of the legendary Arsène Lupin, is the central figure of Lupin the IIIrd: The Immortal Bloodline. His background is that of a master criminal who has amassed a vast collection of treasures, but in this film his hideout is destroyed, leaving behind only a torn map fragment that leads him and his crew to a mysterious, uncharted island in the Bermuda Sea. His personality is defined by a sharp, cunning intellect paired with a devil-may-care attitude and a relentless thirst for adventure. He is confident to the point of arrogance, often taunting his enemies, yet he never loses his playful composure even in the face of supernatural threats. His primary motivation in the story is to uncover the identity of the mastermind behind the attack on his hideout and to claim the treasure hidden on the island, but the challenge quickly becomes a fight for survival against the island's toxic fog and the immortal being Muom. Lupin’s role is that of the leader and strategist, driving the plot forward by assembling his companions and devising plans to outwit an enemy that cannot be killed by conventional means. He maintains a professional but often strained partnership with his loyal marksman Daisuke Jigen and the stoic samurai Goemon Ishikawa XIII, both of whom respect his judgment even when they question his risks. His relationship with the femme fatale Fujiko Mine remains ambiguous—she alternates between ally and rival, and her pursuit of the island’s immortality secret creates tension. The cat-and-mouse dynamic with Inspector Koichi Zenigata continues, as Zenigata follows him to the island and is reluctantly forced into an uneasy survival partnership. Throughout the film, Lupin’s development centers on his resilience and adaptability; he realizes that brute force is useless against Muom and instead relies on his wits, using his own legendary bloodline as a thematic counterpoint to the villain’s immortality. Notable abilities include his mastery of disguise, escape artistry, and improvisational planning—he often creates schemes on the fly and executes backup plans when initial attempts fail. His physical prowess is complemented by his expertise with firearms and gadgets, though he prefers non-lethal solutions unless directly threatened. In the climax, he deliberately leaps into a volcano to sever Muom’s connection to the island’s core, surviving against all odds and demonstrating his signature combination of audacity and intellectual cunning.