Shinichi Kudou operates under his alias Conan Edogawa in "Lupin III vs. Detective Conan: The Movie," retaining his child form due to the APTX-4869 poison from the Black Organization. Originally a renowned high school detective, he was transformed while investigating suspicious individuals at Tropical Land. He assumed the Conan identity to conceal himself, solve cases, pursue an antidote, and shield loved ones from the organization. In this crossover, Conan investigates the theft of the "Cherry Sapphire" gemstone, intersecting with Lupin III's heist. He employs signature deductive skills and gadgets—including his voice-changing bowtie, power-enhancing shoes, and turbo-engine skateboard—to confront adversaries. His investigation exposes a conspiracy by Italian mafia figure Luciano Carnevale and Gilanbar agent Alan Smithee, who seek Vespanian ore to weaponize its electromagnetic-disrupting properties. Conan reluctantly allies with Lupin III when their goals align to prevent the ore's militarization, collaborating in a high-stakes plane hijacking to evade enemies. Though adversaries, Lupin acknowledges Conan as Shinichi Kudou, fueling tension through mutual awareness of each other's capabilities. Conan upholds his commitment to justice, vowing to arrest Lupin's gang eventually. The film recalls their prior crossover: Lupin's preexisting knowledge of Conan's identity and Conan's wariness of Fujiko Mine. His interactions with Jigen feature psychological tactics, like feigning childishness to unsettle him, though Jigen recognizes his intellect. Conan demonstrates his moral code by revealing his true name to a dying foe as a final act of respect. Emotionally, he maintains concern for Ran Mouri, referencing his past romantic confession in London. His alliance with Ai Haibara surfaces when she withholds APTX-4869 antidote details from Fujiko during a shared bath, reinforcing their pact to protect the drug's secrets.