Akuma

Akuma, known as Gouki (豪鬼) in Japan, is a character from the Street Fighter series. He is a cold and extremely powerful warrior whose sole purpose of existence is to hone his fighting skills by battling and destroying strong foes. He rarely displays any sign of emotions, aside from occasional bursts of anger. He is Gouken's younger brother and Ryu's adoptive uncle.

Akuma appears in Street Fighter X Mega Man as a secret final boss. To fight against him, Mega Man must obtain a perfect victory (win without getting hit) against four or more bosses. He attacks with Hadouken, Shouryuken and Tatsumaki. His special is the lethal Shun Goku Satsu.