Akuma , known in Japan as Gouki , is a fictional character from the Street Fighter series of fighting games created by Capcom. Akuma made his debut in Super Street Fighter II Turbo as a secret character and an alternative boss to the villain M. Bison. In the storyline, he is the younger brother of Gouken, Ryu's and Ken's master. After defeating his brother, Akuma gains interest in several fighters, most notably Ryu as he senses that the protagonist has a similar power to him known as the Satsui no Hadou. In some games, he also has an alternate version named Shin Akuma or Shin Gouki in Japanese and Oni Akuma in Super Street Fighter IV: Arcade Edition.