Kousei Hikawa

Kousei Hikawa (氷川構成) is the secondary Rider of Kamen Rider Paleo, Kamen Rider Frostbite (仮面ライダーフローストバイト).

Pre-Series
In the 1980s, Kousei served on a secret national defense team, protecting the world from the Saurians. He acted as a public hero, using man-made Bone Tickets based off Ice Age animals as Kamen Rider Frostbite. One of the monsters who he fought was the T-Rex Sauria, who he discovered was actually a young boy. When the boy came out of his transformation with barely a scratch, Kousei was a little disturbed but didn't think much of it. Eventually, he managed to back the Saurians into their underground base of operations and sealed off the entrance, hoping that was the last he'd see of them.

Hello Again, T-Rex
When it was discovered that the seal wasn't as perfect as he thought it was and that there was a new Kamen Rider in town, Kousei was quick to come out of Rider retirement and track the new Rider down. However, once Ryu and Kousei crossed paths, the veteran rider had a strange feeling that he'd seen Paleo before-and the last time, he was evil. Unaware that Ryu was, in fact, the T-Rex Sauria, he attacked him.