Second Lieutenant Seiki Koito is a pivotal character in the anime series Golden Kamuy. He serves as an officer in the 7th Division of the Imperial Japanese Army. Known for his flamboyant personality and unwavering loyalty, Koito is both a comedic and serious presence in the series. His interactions often add a layer of humor, yet his dedication to his duties and his superior, Lieutenant Tsurumi, shows his depth as a character. Throughout the series, Koito's development and relationships add significant intrigue and complexity to the storyline.