Kojirō Kitajima is the owner of the Kitajima Model Shop, a central hub for LBX enthusiasts in the series. He runs the establishment alongside his wife, Saki Kitajima. The shop is a frequent gathering place for the main protagonist, Ban Yamano, and his circle of friends, who visit to buy parts, customize their LBXs, and battle. In his role as a supporting character, Kitajima acts as a friendly and approachable adult presence within the community. He is popular among the young LBX players who frequent his store, often participating in their practice sessions and offering a space for them to develop their skills. His personality is generally welcoming and good-natured, reflecting a deep passion for the LBX hobby. He is depicted as a person who believes in putting in the necessary work to achieve success, embodying a practical and supportive philosophy. Kitajima maintains close relationships with the main characters, particularly Ban Yamano, Ami Kawamura, and Kazuya Aoshima, acting as a trusted mentor figure who provides materials, advice, and encouragement. His knowledge of LBX parts and customization, integral to his profession as a model shop owner, is a key asset to the young protagonists. While primarily a background figure in the larger conflicts of the series, his establishment serves as a safe haven and a strategic resource, and his steady, encouraging nature makes him a reliable and beloved fixture in their community. He has light brown spiky hair, brown eyes, a light brown beard, and tanned skin.