Rokka Ooguro

"Ari has no future. The Enmi have no future. Mankind... will have a changed future. I will decide it."

- Rokka becoming Daimaō

Rokka Ooguro (大黒六花) is a major antagonist in Kamen Rider Nio. A human collaborator of the Enmi attending the same school as Era Saga, he is chosen to test out their Driver technology as Kamen Rider Maō (仮面ライダー魔王), appearing as a corrupted version of Nio. After his final defeat at Era's hands, he is consumed by his own power and vanishes.

He later returns, greatly changed in mind and body by the experience, and steals the completed Enmi tech. Assuming control over the Enmi, he aims to reach Ari and combines all his powers into the second Kamen Rider Daimaō (仮面ライダー魔王).