Akuma / Gouki (SKW)

Akuma (a.k.a. Gouki in Japan)is a cold and extremely powerful warrior, tied to Ryu's past whose sole reason for being is to hone his fighting skills by battling and destroying strong foes. He fought as a boss twice in Superhero Keyblade Wars, first in his normal state, and then in his Cyber Akuma form, which has not been seen since Marvel Superheroes VS Street Fighter, as an optional boss after Apocalypse has been defeated.