Gennai Hiraga is a secondary character in the anime Moeyo Ken, where he serves as the resident scientist and inventor for the Mobile Shinsengumi. His background establishes him as a creative and mechanically minded individual, often applying his technical skills to solve problems or create new devices for the group. In one instance, his inventive nature leads him to convince the cat monster Nekomaru to participate in one of his experiments. One of his notable creations is a mechanical puppet modeled after the mother of Toshie Hijikata, one of the main heroines, though this creation malfunctions and goes on a rampage, demonstrating that his inventions can be unpredictable. Despite the potential for mishaps, his role within the organization is that of a support specialist, using his intellect and technical expertise to aid the team, which primarily consists of the young women who carry on the legacy of the Shinsengumi. His personality can be characterized as that of an eccentric genius, passionate about his work, though the slapstick and comedic tone of the series ensures that his contributions are often a source of humor as much as practical aid.