Gai Amatsu/Kamen Rider Thouser

Gai Amatsu is the CEO of Zaia Enterprise Japan and the main antagonist of Kamen Rider Zero-One.

He is Yua Yaiba's superior and the benefactor of A.I.M.S. Secretly, he is the one who programmed the Ark satellite to deem humanity as a threat to the world by introducing it with knowledge about humanity's atrocities, leading to the Daybreak Town Incident and the creation of MetsubouJinrai.NET. He seeks to have Zaia Enterprise take over Hiden Intelligence by inciting panic over HumaGears to lower Hiden's stock.