Fourteen

Fourteen, also known as Jashin 14, is the ruler of the World of Diend and main antagonist of the "Diend" arc of Kamen Rider Decade.

History
The ruler of the World of Diend, Fourteen commanded an army of Darkroaches and regularly brainwashed humans to serve him.

Fourteen was confronted Kamen Rider Decade and his allies when they traveled to the World of Diend. Facing the, Fourteen assumes his true form as Jashin 14 to fight the Riders. He was cut in half by Decade in Complete Form with aid from Armed Hibiki. After Fourteen was destroyed, the Roaches vanished and everyone brainwashed by him was set free.