Tsukihito Amanuma

Tsukihito Amanuma, also known as Gamemaster, 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.

Trouble in London
Gamemaster is in a league with Diana as a host, player and one of Diana's heralds.