Satsui No Hadou

To tap into Satsui no Hadou, a fighter must be so consumed with the desire to win that they are willing to kill. As a result, only people who push themselves to be the best at all costs can take advantage of it. However, the untrained mind can be driven to a temporary insanity if they have not prepared for it. For those who do succeed in controlling it, they develop an almost cold, clinical detachment from themselves. After Akuma tamed the Satsui no Hadou, he lost all of his humanity and became a fighter who only seeks to become the strongest in the world. As such, Satsui no Hadou makes a human unbelievably powerful but at the cost of losing one's humanity. Akuma's understanding of Satsui no Hadou is so great, he can seal himself off from it, giving lesser opponents a fighting chance. Learning Satsui no Hadou is the first step in learning the most fatal technique known to all of Goutetsu-Ryuu Ansatsuken, Shun Goku Satsu.Goutetsu himself was once seen meditating while tapping into Satsui no Hadou, so he probably encouraged, or at least accepted, it. This was also how both his students Gouken and Akuma were introduced to the power. Goutetsu would also have had to teach Satsui no Hadou to his pupils if he did teach them the Shun Goku Satsu. Finally, he was actually pleased with his student Akuma for tapping into Satsui no Hadou during a life or death battle for control of their school. Gouken, a student of Goutetsu who taught a toned-down derivation of his style, detested Satsui no Hadou since he believed it encouraged killing. He condemned his brother Akuma for corrupting his Hadou no Chikara (Surge of power).Originally, Ryu scarred Sagat with a single Shoryuken. It was later retconned that Ryu lost control of himself (when Sagat offered to help him up) by rising up fist first, upsetting Sagat (and nearly killing him) with a Metsu Shoryuken. His attack took on the properties of Goutetsu's original art despite having never been taught it by his master Gouken. Although Sagat wanted revenge for his scarred chest, he never knew that the scar came from the Satsui no Hadou, a dark power that consumed Ryu sometime in 1987. During Street Fighter Alpha 2, Ryu finally realized that the Satsui no Hadou was the culprit behind his cheap victory over Sagat. Knowing about this dark intent, Ryu has vowed to reject the Satsui no Hadou. It was not until the end of Street Fighter Alpha 3 that Ryu was able to fully reject the Satsui no Hadou.