According to Street fighter alpha generations Satsui no hado is a power that was awakened by particular warriors with exceptional fighting skill and it was used for assasinations....people like ryu and gouki(akuma) have inherited this power....eventually Satsui no hado was forbidden as it was considered too powerful and evil, because of this unlike akuma, ryu refuses to give in.
Those who use the Satsui No hado have unrivaled strength and skill at the cost of losing their basic humanity and appereance.
GOUKEN Akuma (Gouki) is the brother of Ryu and Ken's late master: Gouken. Gouken and Akuma's master was called Goutetsu and tried to stop Gouki form using the dark hadou by battling him, Gouki killed Goutestsu using the Satsui no hado (dark hado), out of anger Gouken fought Gouki who later changed his name to Akuma to show his disconnection from his ''weak'' brother. Akuma again used the satsui no hado and murdered his brother Gouken.
The cast of Dai hado enjerusu - 1992 includes: Aki Mukai
on-o-ran-hado
The cast of Michinoku satsui no tabi - 2007 includes: Sachiko Kokubu Hideki Takahashi
The cast of Dai hado enjerusu kiken ni dakareta onnatachi - 1993 includes: Aki Mukai
i think there are only 2 kidos:bakudo and hado
Hadō #4 ByakuraiHadō #33 SōkatsuiBakudō #61 Rikujōkōrō
Makiko Koike has written: 'Yasashii yoru no satsui'
The cast of Satsui - 2004 includes: Akira Hamada Kazuaki Hankai Rina Hidaka Susumu Kobayashi Rika Nakae Takehiko Ono Kaori Shima Reiko Takashima Jimon Terakado
The cast of Orion no satsui yori - Joji no houteishiki - 1978 includes: Ako as The classmate Shogo Kano as The boy Akemi Negishi as The mother Rokko Toura as The father Miyako Yamaguchi as The stepmother
The cast of Hada Madrina - 2013 includes: Daniel Delevin as Hado
It means: "how unlucky, fate watches over us."