Gai Amatsu

"This is going according to my scenario. 100%... no, 1,000%."

- Gai explains his plan to Yua Yaiba to take over Hiden Intelligence.

Gai Amatsu (天津 垓) is the CEO of Zaia Enterprise. He is also Yua Yaiba's superior and the secret benefactor of A.I.M.S., with his company producing much of the agency's technology, as well as being creator of the Ark. Using the Zaia ThousanDriver, Gai will transform into Kamen Rider Thouser (仮面ライダーサウザー).

First Revelation
to be added

Zero-One's Evolution, Shining Hopper
"So Zero-One has become 30%. No, 40% stronger than before. I can't wait to see how it will go when Kamen Rider Thouser has come"

- Gai's evaluation on Zero-One Shining Hopper

to be added

True Agenda Revelation and Taking Over Hiden Intelligence
"Everything is according to my plan, 1000%. Now, it's time for my era to come"

- Gai Amatsu's proclamation after succeeding on taking over Hiden Corps After the destruction of Jin, Yua confirms to Gai that Metsuboujinrai is over. However, Gai tells that Metsuboujinrai will never end as long as Ark is still exist and tells Yua about everything he knows prior the Daybreak. Yua in horror notices that Gai has planned everything from the start and doesn't care about her alongside Isamu. Gai leaves her as he proceeds to the next phase.

After Aruto and Isamu have destroyed Dodo Magia and Berotha Magia, the press conferences call on Aruto and demands the truth on how the harming HumaGears are still exist. Gai comes to the site and claims that Aruto doesn't know everything and presents himself to take over Hiden Intelligence to take care of the HumaGear problems without Aruto's concern. In satisfaction of winning everything, he goes back to his room, takes out the Zaia ThousanDriver, and self proclaims that his era is now coming.

Personality
Gai provides much of AIMS' technology, like the ShotRiser and the Gigers. He is seeking to undermine Hiden Intelligence to eliminate competition, as he attempted to coerce Aruto into selling the company to him.

Soon, Gai is revealed to have the knowledge everything about the Ark and Metsuboujinrai more than the rests. Gai even admits himself to have work alongside Ark in order to take over Hiden and become the ruler of the new era of HumaGear. While Yua is struggling to accept the cruel reality of what kind of a person is Gai, Gai doesn't care as long as his plan has moved completely well.

Forms
Kamen Rider Thouser "Zetsumetsu evolution! PerfectRise! When the five horns cross, the golden soldier Thouser is born. Presented by Zaia."

- Transformation announcement

Rider Statistics Ability Parameters
 * Rider Height:
 * Rider Weight:
 * Punching Power:
 * Kicking Power:
 * Maximum Jump Height:
 * Maximum Running Speed:

Thouser's base form is accessed by using Amazing Caucasus Progrise Key and the Awaking Arsino Zetsumerise Key together in the Zaia ThousanDriver.

Appearances: Kamen Rider: Reiwa The First Generation, Zero-One Episode 17

Devices

 * Zaia ThousanDriver: Thouser's transformation belt. Unlike other Riders, Thouser uses a combination of a Progrise Key and Zetsumerise Key to transform.
 * Progrise Keys
 * Zetsumerise Keys
 * Progrise Holder

Weapons

 * Thousand Jacker

Portrayal

 * Gai Amatsu is portrayed by Nachi Sakuragi (桜木那智).

Etymology

 * His first name Gai (垓) is a numeral character which means 1020 in Chinese and Japanese.

Appearances

 * Icon-zero-one.png Kamen Rider Zero-One
 * Episode 3:  That Man, Sushi Chef
 * Episode 6: I Want to Hear Your Voice
 * Episode 10: I am an Actor, Shinya Owada
 * Episode 11: Don't Stop the Camera, Stop That Guy!
 * Episode 13: I Work as the President's Secretary
 * Episode 14: We are the Astronaut Brothers!
 * Episode 15: The End of Each
 * Episode 16: This is the Dawn of ZAIA
 * Icon-zi-o.png Kamen Rider: Reiwa The First Generation (As Thouser)
 * Episode 17: I'm the Only President and a Kamen Rider