Kamen Rider ZX is a fictional character in the long running Kamen Rider series. ZX makes his first appearance in the special Birth of the 10th! Kamen Riders All Together!! as his appearance as the tenth Kamen Rider.
Ryo Murasame
Ryo Murasame and his sister were shot down while flying in the Amazon jungle by a terrorist organization known as the Badan Empire and had both of them captured. Later, Badan kills his sister and turns Murasame into a cyborg warrior named ZX and brainwashes him; however, an accident enables him to regain his memory. Murasame becomes a Kamen Rider to avenge his sister. His first encounter with the past Kamen Riders is when he mistakes both Kamen Rider Super-1 and Riderman as soldiers of Badan.
Kamen Rider Spirits
In the Kamen Rider Spirits manga, Murasame is an evil rider of Badan Empire. Having his memory wiped off by Badan, Murasame becomes emotionless and fights against the 9 Kamen Riders and humanity. When Murasame regains his memory and realizes that his sister Shizuka was killed by Badan, he turns against them and eventually joining forces with other riders to destroy Badan and its evil leader Judo.