Genta Kojima attends Teitan Elementary School and is a core member of the Detective Boys, an amateur sleuthing group formed by classmates. He, Ayumi Yoshida, and Mitsuhiko Tsuburaya formed the group after Conan Edogawa joined their class. Genta routinely declares himself the leader, yet the group instinctively depends on Conan's deductions during cases. Fellow students submit cases to the group via Genta's school shoe locker. He lives with his parents, owners of "Kojima Liquors", as their only child. An uncle resides in Gifu Prefecture. Genta deeply admires his father, whom he describes as a classic "Child of Edo". His personality blends loud brashness with genuine kindness; he often acts on impulse without considering consequences, frequently leading the Detective Boys into peril. Despite this, he demonstrates steadfast loyalty and dependability towards Ayumi and Mitsuhiko. Genta harbors a crush on Ayumi and feels jealous when she shows romantic interest in Conan. Food dominates his character, particularly an obsession with braised eel on rice. He measures monetary value by potential eel bowls and insists on finishing all his rice to avoid divine punishment. Genta struggles with Japanese, frequently confusing homophones (especially food-related terms) and recognizing kanji, which sometimes draws peer ridicule. Academically, he faces challenges contrasting with Mitsuhiko's intellectual curiosity. Physically, he weighs about 40 kilograms with a sturdy build, making him slightly taller and stronger than classmates. A small circular bald spot is visible on the left side of his head. In *Lupin III vs. Detective Conan: The Movie*, Genta participates with the Detective Boys in the case of the stolen Cherry Sapphire gemstone and the conspiracy involving singer Emilio Baretti. His involvement follows his established pattern: contributing to group investigations and supporting friends in danger, with no unique character development or individual actions specific to the film documented. The narrative centers on the Conan Edogawa and Lupin III confrontation, with the Detective Boys in their recurring supporting role. Across all media appearances – films, OVAs, television specials – Genta maintains consistent characterization without significant evolution. His role emphasizes comic relief through food humor and linguistic errors, occasionally highlighting bravery or loyalty. These appearances reinforce his established traits. His name, originating from mystery writer Hajime Komine, combines "Kojima" (little island) and "Genta" (characters for "origin" and "plump").