Toshio Tachibana is Shiroi Senshi Yamato main enemy with along his father. He is son of Tachibana family who match the family dogs in dog fighting competitions. He is Ryo Fujiwara's rival and his greatest ambition is to hit Yamato. Toshio met Ryo and Yamato for the first time, the duo attacked the bear was gone. Toshio fell the bear and his dog Bruiser involved Dam down, after which the Yamato saved him. However, Toshio later began to plan the killing of Yamato with his father.