Riku Kagami

Arata and Ryo's father, Riku Kagami is a high ranked official in ZECT, and serves as a figurehead to hide their connection to the natives. Arata seems to despise him because of Ryo's disappearance, as well as the lack of concern or activity done in order to find Ryo. Arata is also unaware that his father is even part of the organization, ZECT, let alone the leader. A mysterious person who always quotes animal bibles, he is also the chief of police. He is a highly trained fencer and plays the cello. It seems that he has a very secret agenda and would even sacrifice his sons to achieve his goals. Tendou later confronted Riku; the confrontation ended with Riku telling him that Tendou's sister (actually refers to Hiyori, not Juka) was not in good hands, which naturally made Tendou lose his composure, and Riku walked off, joking about Tendou's "walking down the path to heaven to rule over all".

During the end of episode 36, he displays that he indeed knows about the Hopper Riders, saying they have opened the Gates of Hell. He also says the Rider's grand plan will be completed by our sons, showing that he did indeed know Tendou's father. He tells Kagami of the secrets behind the Masked Rider System in episode 41, displaying his knowledge of the Natives and how they created the system. He also tells Tendou that his father was the one who installed the Red Shoes system in the Zecters, and in turn, Tendou decides to trust him because he too desires to walk the path his father took. He is overthrown from his leadership position at ZECT by Mishima after revealing to Negishi the Red-Shoes system implemented into the Zecters. He is still alive in the epilogue watching his son grow up. It is likely he is now simply the chief of police. 52 years old.