Evil Ryu

Evil Ryu, also known as Satsui no Hado ni Mezameta Ryū (殺意の波動に目覚めたリュウ, Satsui no Hadō ni Mezameta Ryū, "Ryu who has Awakened to the Surge of Killing Intent", Satsui Ryu in short), or Dark Ryu in the UDON comics, is a secondary antagonist in Street Fighter games beginning with Street Fighter Alpha 2. He was originally introduced in a Street Fighter Zero manga series authored by Masahiko Nakahira and later adapted in the Street Fighter canon by Capcom.

Apperance:
Evil Ryu often appears as a palette swap of Ryu wearing a black gi, though the Alpha series also gives him a black head band. His skin also becomes a slightly darker shade along with his hair. From CvS onward, he has been depicted with red pupils, although some games leave his eyes entirely red.

In Super Street Fighter IV: Arcade Edition, his design was given an update, taking on a much more feral appearance with traits taken from Akuma. His eyes now glow and his hair spikes up with red tint. Most notable of all is a gaping hole bored into his chest, with a similar scar on his back that bears a glowing ten kanji. The scar resembles the effects of being hit up close with the Medio Gohado that is used by Oni. He appears far more menacing and powerful than his Alpha version.