Tsukihito Amanuma (天沼 月人, Amanuma Tsukihito), also known as Gamemaster (遊熟者 (ゲームマスター), Yūjukumono (Gēmu Masutā), literally translated as Thoroughly-Wild Person), is a human who develops superhuman powers as a result of the demon plane hole opened by Sensui. Amanuma is able to bring video games to life, creating his territory within them. He is also a former member of the Sensui Seven.