The fifth member of the Organization. Elaeus's Nobody, he uses a huge tomahawk. He has control over the element of Earth. When
Lexaeus and Zexion find out about Marluxia's plan to use Sora to overthrow the Organization, they try to use Riku in the same
way against him. Lexaeus attempts ot get Riku to open his heart completly to darkness. Riku kills Lexaeus.