Name: Keisuke Jin
Designation: Kamen Rider X
Weapons: Ridol Whip, Ridol Stick, Ridol Rope, Longpole
Gear: Ridol, Cruiser
Keisuke Jin was the son of Robotics scientist Keitaro Jin who was devising the technology for undersea exploration. However, Keisuke and his father were attacked by Neptune of the G.O.D. organization which wanted the technology for their use. As a result, Keisuke suffered mortal injuries inflicted from the ordeal with his father forced to perform surgery on his son with what little of his inventions to make his son into a "Kaizorg" to save his life before he succumbed to his own injuries. Driven to avenge his father's death and save the world, Keisuke battles G.O.D. For the first 27 episodes, Keisuke's used the phrase "Set Up" and jumps into the air with his bodysuit manifesting as he removes the "Redizer" & "Perfecter" from the sides of his belt to form his helmet and then snap up the faceplate to complete the transformation. From Episode 28 onward, Keisuke uses the phrase "Dai Henshin!" to transform while making a "X" sign with his arms. As a Kaizorg, Keisuke is a master of undersea combat. His exoskeleton is made of a special super alloy called Special Structure that allows him to survive the heavy pressure of ten thousand meters below sea level with an artificial lung to breathe underwater.