Akuma

Akuma is a character and recurring antagonist of the Street Fighter series, first appearing in Super Street Fighter II Turbo as a hidden boss. He is an emotionless and powerful warrior fixated on mastering the Satsui no Hado.

Personality
Akuma is a cold and extremely powerful warrior whose sole reason for being 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, and rarely smiles. He takes his training very seriously and deals brutally with those who dare interrupt him, as seen in his Street Fighter III: 3rd Strike ending. Occasionally, he likes to test himself against worthy rivals. In later games, Akuma often refers to himself as a "denizen of hell" and "evil incarnate", and is seen as such by many. This may be a result of the Satsui no Hado ("Surge of Murderous Intent") taking a toll on his mind.

In line with his martial arts philosophy, Akuma also believes in a certain principle of self-worth. Specifically, Akuma despises hubris (i.e. a perceived excess of self-worth), foolish behavior, and those who rely on means other than their fists to fight or gain power (both of which would indicate a lack of the same), as his various win quotes in the Street Fighter IV games indicate. He is also somewhat nihilistic by principle, as his search for worthy opponents often includes someone who would be able to kill him.

Akuma detests his brother Gouken for not giving in to the dark side of their arts which is, according to Akuma, the way they were intended to be used. He also blames Gouken for sealing off the darkness within Ryu, thus preventing Ryu from reaching his true potential. This forces Akuma to give up on his planned duel with Ryu, as he believes that only a fellow practitioner of Satsui no Hado can one day hope to defeat him.