Koji (宏次, Kōji) is a recurring character in the Yakuza series, first introduced in Yakuza 3. He is one of the residents of Morning Glory Orphanage.
Koji is into sports and often pesters the other children into playing at the beach with him. He taught Mitsuo how to play baseball, but Mitsuo subsequently outgrew him in talent. Later on, he develops an interest in reading Manga.