Shintaro is commander of the Ganma Army. In Nangoku Shonen Papuwa kun, He was washed up on Papuwa island as he runs away from Gamma army. To get back a blue stone from Papuwa, he starts life with Papuwa Island. He is Kotaro's older brother and Magic's oldest son. Shintaro's and Kotaro's uncle is Harlem. They also share the same cousin - Kentaro.