|Status||Imprisoned in a Mask|
|Previous Affiliation||Feudal Japan|
|Debut/Closing||Season 4 Episode 13|
He is red, has yellow eyes and hairy eyebrows.
In Ninja Twilight, Aka's mask was found in a wrecked ship underwater. Jade noted getting this mask was too easy, as it turned out Tarakudo had other plans. After the nine masks was joined together, all of the Oni generals were freed and tried to destroy the world. Aka was walking with Rairakku to one of the four corners of the earth. They were briefly defeated by Jackie and Super Moose but Tarakudo managed to capture them. After Jade put Tarakudo's mask on his face, all the Oni and Shadowkhan were imprisoned within.