Geiz Myokoin

"I'm going to kill him."

- Geiz's declaration to kill Sougo Tokiwa in order to change the future.

Geiz Myoukouin (明光院 ゲイツ) is a warrior from the year 2068 who transforms into Kamen Rider Geiz (仮面ライダーゲイツ), the secondary rider of Kamen Rider Zi-O.

History
Geiz comes from 50 years in the future where he fought as a resistance fighter against the evil tyranny of the demonic king, Oma Zi-O. He travels back in time to kill Sougo before he can become the king destined to enslave the future.

Personality
Currently not much known about Geiz, except the fact that he is one of the rebellion against Oma Zi-O who lost the fight and he lost someone close to him that died fighting Oma Zi-O, which shaped his vengeful personality. He is incredibly stealthy, as shown when he was able to easily sneak up on Sougo using the Time Mazine, not being noticed until the last minute by Tsukuyomi. Geiz is also incredibly determined to kill Sougo and he is highly paranoid towards the latter, as he is the one believed to be Oma Zi-O's true identity in the future.

Although somewhat baffled with Sougo kind actions towards him and Tsukuyomi, Geiz discreetly declares that his vendetta isn't fading away. He is stubborn and often wants to resolve problems on his own, but has softened a bit to the idea of Zi-O helping him stop various Another Riders despite their tense relations.

Power & Abilities

 * Stealth Proficiency: Geiz capable to sneak on its target or arriving on where his target will come into.
 * German Language Interpretation: Geiz has knowledge of German language as seen when he read Emu's note of the bug of the Another Ex Aid's gate to come inside the game.
 * Genius-Level Intellect: At the very least, his use of BuildArmor and his finisher, Vortex Time Burst, indicate that Geiz is proficient in equation and scientific formulae.

Forms
Like Zi-O, Geiz transforms by inserting the Geiz Ridewatch into the right-hand side of the Ziku-Driver and rotating the Driver 360 degrees. He accesses Rider Armor (ライダーアーマー) forms based on previous Kamen Riders by inserting Ridewatches into the left-hand side of the Ziku-Driver.

Devices

 * Ziku-Driver - Transformation device
 * Ridewatches - Transformation trinkets
 * Ridewatch Holder - A strap to carry Ridewatches
 * Faizphone X - Communication device

Weapons
Handheld weapons:
 * Zikan Zax - Geiz's personal weapon
 * Zikan Zaclaw - Geiz Revive's personal weapon
 * Faizphone X - Upgraded version of the SB-555P Faiz Phone wielded by FaizArmor

Suit-equipped weapons:
 * Shift Speed Speeds - Autonomous attack units provided by DriveArmor
 * Faiz Shot Shot - FaizArmor's replica of the SB-555C Faiz Shot accessed using the Faizphone X
 * Faiz Pointer Pointer - FaizArmor's replica of the SB-555L Faiz Pointer accessed using the Faizphone X
 * Drill Crusher Crusher - BuildArmor's personal weapon based on the Drill Crusher

Vehicles

 * Ride Striker
 * Time Mazine

Portrayal
Geiz Myoukouin is portrayed by Gaku Oshida (押田 岳). As Kamen Rider Geiz, his suit actor is Yuya Nawata (縄田 雄哉), whose previous suit acting role was that of Kamen Rider Build in the previous series' finale. Geiz is the first Secondary Rider since Zeronos not to have either Eitoku and/or Jun Watanabe as his suit actor.

Etymology
"Geiz" is a German word which means "stinginess" or "miserliness". However, according to Woz, Geiz actually means "King" (王) in their series as a counterpart to "Zi-O". It is a pun on English word "Gates" since in Japanese and Ancient Egyptian culture, and  both having "gate" etymologies: "a gate connects god and human" or "a gate connects humanity and future". The reason why using "Gates" instead of "Gate" is because of Toei staff's superstition. .