RX's friends/allies

To battle the Crisis Empire, in addition to the other ten famous masked riders, these humans also gave RX a helping hand:

Reiko Shiratori

Kotaro's girlfriend. She is also a photojournalist.

Kyoko Matoba

Psychokinetic woman whose parents were slain by the Crisis. In addition to her telekinetic powers, she is an expert archer.

Kasumi No Joe(Joe of the Mist)

Former Crisis warrior, now RX's ally in the battle against the Crisis Empire.Another 'reconstructed human'-known in Kamen Rider terms as a "Kaizo ningen."

Hayato Hayamitsu

Lieutenant police officer.

The Sahara family

The Saharas owned a helicopter business, in which Kotaro was an employee of. Left to right:Shunkichi Sahara, his wife Utako, and their children Shigeru and Hitomi.