Kojiro Inukai serves as a rival character within the "Whole Japan" group of adversaries opposing the main baseball team. He is encountered during nationwide competitions, signifying his standing as a skilled player within the series. His physical traits include distinctive sideburns and he is frequently depicted wearing a cap. The available information provides no detailed background story, character development, specific narrative arcs, evolution across official media, baseball position, playing style, personal history, relationships, or contributions to the plot beyond his classification as a rival.