Violent Ken

Violent Ken is an alternate version of Ken that appears in SNK vs. Capcom: SVC Chaos.

Story
Violent Ken is the result of Ken absorbing the Orochi power from the King of Fighters series. He was inspired by "Sennou Ken" (Brainwashed Ken in Japanese), which was depicted in Street Fighter II: The Animated Movie, during which M. Bison induced a large amount of Psycho Power to transform Ken into a killing machine. Though Brainwashed Ken has little to do with the Satsui no Hado, Ken, while fighting against his Violent form in the SVC Chaos, he wonders if deep down, he desires this.

Both Ken and Violent Ken's ending in the game are almost the same. However, in the beginning of Violent Ken's ending, after the last battle, the evil power that was plaguing Ken lost it's hold on him, returning him back to normal. However, after being returned back home, Ken no longer remembers what happened to him, or what he had done during the duration of his Arcade Mode story, and then the rest of Ken's ending plays from there.

Gameplay
Violent Ken uses purple flames instead of regular ones in his Shoryuken, which is a feature of Akuma's Hadokens and Shoryukens from the Marvel vs. Capcom series, and a pillar of energy appears at the end of his Exceed move, which is a feature of Rugal's DMs in The King of Fighters. He seems to speak with a calm sinister voice, while combining it with incoherent screams similar to Riot of the Blood Iori.

Comics
In the eight volume comic adaptation of SNK vs. Capcom: SVC Chaos, Ken was covinced by Red Arremer to join him, and was forced to undergo a brain-changing operation (despite reconsidering after thinking of Eliza and his son Mel), which turned him into Violent Ken. He lost to Ryu within the later volumes, and was returned to normal.

Project X Zone 2
An alternate evil form similar to Violent Ken briefly appeared in the Capcom, Sega and Namco crossover game Project X Zone 2, where he served as an enemy/rival when Ryu and Ken's Pair Selection is locked. The appearance is the same as Ken's normal design, except for the purple flames and red eyes. Ryu managed to snap him back with Shin Shoryuken, just like when Ryu becomes Evil Ryu, and Ken managed to snap him back with Shin Shoryuken in the Namco X series' first game, Namco X Capcom.