Goemon Ishikawa XIII, thirteenth-generation heir to the legendary outlaw Ishikawa Goemon, emerges in the pilot film as a traditional samurai and initial adversary to Lupin III. Tasked with proving his martial superiority, he confronts Lupin at his mansion, only to slice through a decoy—a policeman disguised in a Lupin bodysuit. The error triggers palpable regret, exposing his pride and the risks of underestimating foes.

Across media, Goemon is a martial arts virtuoso, excelling in Kenjutsu and Battōjutsu, his Zantetsuken sword slicing effortlessly through most materials. He frequently mourns severing "unworthy" targets, bound by the creed that a katana must taste blood before resheathing. Early manga and anime portray him as Lupin’s rival, dispatched to steal secrets or assassinate him. Repeated defeats and grudging respect for Lupin’s wit gradually shift him into a reluctant ally, though their early collaborations remain strictly transactional.

Steeped in tradition, Goemon dons classic attire, savors Japanese cuisine, and meditates devoutly. His vulnerabilities include gullibility toward women’s ploys, susceptibility to enlightenment scams, and unease with modern tech—though he sporadically adopts devices like cellphones. Honor-bound, he shields the vulnerable, particularly children, frequently aligning with Lupin’s crew for righteous causes despite disapproving of their tactics.

In *The Blood Spray of Goemon Ishikawa*, a botched bodyguard mission drives him to atone through brutal training, honing his senses to overcome a powerful adversary. This arc underscores his tireless self-refinement and willingness to endure agony for his ideals.

His evolution weaves stoic resolve with sporadic vulnerability—humorous flashes of frustration or fear. While later series deepen his loyalty to Lupin’s team, he remains reserved, often tempering Lupin’s impulsivity with principled restraint.