Professor Gō (郷博士 Gō Hakase) is the inventor of Action Mask's weapons and vehicles to fight evil. He saved the life of Tarō and provides the latest weapons and new technologies for Action Mask which always causes him to emerge victorious. In the manga, his name is Kitakasukabe (北春日部 Kitakasukabe).
In the spin-off manga, he leads a task force that investigates the cause of the seed outbreak in Saitama.
Japanese: Rokurō Naya