Tsukasa Kadoya

I'm just a passing-through Kamen Rider. Remember that!

Tsukasa Kadoya in Kamen Rider Zi-O

Tsukasa Kadoya (Japanese: (門矢 士) is the main character of Kamen Rider Decade and transforms into the titular Rider. He is played by Masahiro Inoue.

Rider Armors

Rider Armors (ライダーアーマー Raidā Āmā) are forms based on Kamen Riders accessed through Ridewatches.
 

Geiz WizardArmor and Zi-O FourzeArmor

Rider Armors are formed by inserting a Ridewatch on the left side of the Ziku- Driver and spinning it once. It will then announce the right hand Ridewatch before announcing the left Ridewatch and sub-sequentially summoning the Rider Armor that forms around the Kamen Rider.

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.

Sougo Tokiwa

"I've got a feeling this will work out!"

Sougo Tokiwa Wearing the Ziku Driver

Sougo Tokiwa (常磐ソウゴ Tokiwa Sōgo) A 18-year-old high school student who dreams one day of becoming a king. When Tsukuyomi and Woz travel to his time in the future from 50 years, he learns that he is destined to become the tyrannical ruler of their time, Ohma Zi-O. With this knowledge, he makes it his goal to become a great king through kindness by becoming a Kamen Rider Zi- O (仮面ライダージオウ Kamen Raidā Jiō). However, he faces Geiz Myoukouin, a future Kamen rider who wants to kill him to change the course of history.