Jakō Ryūdōin

and his brothers, Rokkaku and Genshō, are introduced in the anime.

Appearance
Jakō wears a purple cloth that covers his whole body.

Third Great Beast arc
They seek revenge on Might Guy for their father's humiliation and death. He and his brothers Manipulated Wooden dummies to attack Guy, which failed due to Guy's great taijutsu skills. He also created the temple in which to enclose Guy and Lee.

Naruto: Path of the Ninja 2
Jakō also made an appearance in Naruto: Path of the Ninja 2. In the game he is trying to conquer the world using the power of the Spirit Beast. With the spirit beasts' evil spirits he would force others to fight against their allies. In the end, Rokkaku is killed by Genshō, because he is defeated by Naruto, Sakura, Shikamaru and the other Genin. Later Naruto defeats Genshō, along with the Spirit Beast.

Trivia

 * Jakō's name means "evil light."