悪魔 (Japanese for "Devil" or "Demon"), known in Japan as Gouki (豪鬼 Gōki, lit. "Great Demon" or "Great Ogre"), is a fictional character from the Street Fighter series of fighting games by Capcom. Akuma made his debut in Super Street Fighter II Turbo as a secret character and hidden Boss. In the storyline of the Street Fighter video games, he is the younger brother of Gouken, Ryu's and Ken's master. In some games he also has an enhanced version named Shin Akuma, or Shin Gouki (真・豪鬼 Shin Gōki, the "true Great Demon") in Japanese. Since his debut, Akuma has appeared in several subsequent titles and has been well received by both fans and critics.