Geiz Myoukouin

Geiz Wearing the Ziku Driver and Ridewatch Holder

Geiz Myoukouin (明光院 ゲイツ Myōkōin Geitsu) is a soldier from the year 2068, where he fought as a resistance fighter against the demonic king's evil tyranny, Ohma Zi- O. After Ohma Zi- O kills many of the resistance fighters, he decides to travel back in time to kill Ohma Zi-O before he can become the king destined to enslave the future, much to Tsukuyomi 's frustration. Tsukuyomi follows Geiz discreetly later.

He uses the Ziku Driver and Geiz Ridewatch to transform into Kamen Rider Geiz (仮面ライダーゲイツ Kamen Raidā Geitsu), the secondary rider of Kamen Rider Zi-O.