Goemon Ishikawa XIII, thirteenth-generation heir to the legendary bandit Ishikawa Goemon, upholds his lineage through masterful swordsmanship and unwavering commitment to tradition. He wields the blade Zantetsuken, famed for slicing through steel, vehicles, and bullets—a prowess repeatedly proven in perilous clashes. His stoic demeanor is marked by fierce pride in his skills and an unyielding code of honor. Meditation anchors his focus, while failures or damage to Zantetsuken trigger profound shame. He rigorously observes Japanese customs: donning hakama and fundoshi, consuming only native cuisine, and honoring Buddhist-Shinto practices. Despite his reserve, he displays vulnerability around women, whom he treats with wary protectiveness—a weakness that lures him into tricky scenarios, though he limits contact to safeguard his training discipline. In *Lupin III vs. Detective Conan: The Movie*, coerced by Fujiko Mine’s explosive-collar hostage situation, Goemon aids Lupin’s quest for the Cherry Sapphire—a gem tied to Vespania’s coveted mineral ore. Posing as the gem’s owner, he executes a covert exchange with antagonist Alan Smithee, revealing his adaptability to deception. His swordplay proves pivotal, severing projectiles and supporting allies during the climax aboard a crippled aircraft. Beyond the blade, he masters Kenjutsu, Battōjutsu, Jujutsu, Aikido, and Karate, disarming foes non-lethally by shredding weapons or garments. After such strikes, he often quips, "I have cut yet another worthless object," underscoring his restraint. Modern technology baffles him, forcing reliance on others for electronics or vehicles—though portrayals vary. Loyal to Lupin yet disdainful of his levity, he shares a mutual warrior respect with Daisuke Jigen. Originally an adversary, Goemon targeted Lupin for stealing his family’s chemical formula. After futile assassination attempts, he acknowledged Lupin’s prowess and defected, cementing a pragmatic alliance built on skill over vendetta.