Goemon Ishikawa XIII, the thirteenth-generation descendant of the famed Japanese figure Ishikawa Goemon, wields the ancestral sword Zantetsuken. This blade, capable of cutting nearly any substance, serves as his primary weapon and defining symbol. Initially opposing Lupin III due to a past transgression, Goemon's repeated confrontations fostered a deep respect, leading him to switch allegiances and become one of Lupin's most trusted allies. His loyalty persists despite frequent exasperation with Lupin's antics. Goemon shares a more amicable rapport with Daisuke Jigen but maintains a general distrust of Fujiko Mine due to her exploitative nature, though he will assist her when needed. In the crossover *Lupin III vs. Detective Conan: The Movie*, operating with Lupin's crew during a heist targeting the Cherry Sapphire, Goemon adopts the alias "Eishin Wakagomo." He infiltrates Tokyo Bank as part of Lupin's scheme to intercept a rare mineral possessing stealth properties, crucial to Count Keith Dan Stinger's mission to recover Vespanian ore and prevent its militarization. Disguised as Kaitou Kid during the heist, Goemon cleaves Conan Edogawa's turbo-engine skateboard in two, showcasing his precision swordsmanship. Further explored in the OVA *The Blood Spray of Goemon Ishikawa*, Goemon accepts employment as bodyguard for yakuza boss Makio Inaniwa. Facing the mercenary Hawk, he suffers a humiliating defeat where his sword is damaged. This loss triggers intense training where he hones his senses to razor-sharp acuity, culminating in the awakening of a "sixth sense" allowing him to predict opponents' movements. He later reclaims his honor by defeating Hawk in a rematch, severing the mercenary's arm and forcing his surrender, emphasizing his unwavering commitment to samurai principles where personal honor and sword mastery supersede all else. Across all appearances, Goemon embodies the archetype of the stoic warrior: disciplined, duty-bound, and perpetually seeking challenges to refine his combat prowess. His interactions reflect a strict moral code, often contrasting with his allies' chaotic tendencies, yet his loyalty remains absolute in critical moments. The near-indestructible Zantetsuken symbolizes his identity, occasionally functioning as a plot device against resistant materials. His character development consistently revolves around navigating the tension between traditional samurai values and the unpredictable world of heists and alliances he inhabits.