Koichi Nanbara

, or , is a scientist and a director of the G.O.D. Science Development Bureau who developed the RS Device. He have one daughter named Rie. Unable to endure the remorse of conscience of what was completed, he defected. He was chased by Toad-Goemon and was rescued by X-Rider, but was assassinated by Scorpion-Geronimo. Just before he dies, he entrusts Keisuke with a pendant containing part of the blueprint.
While escaping, Dr. Nanbara broke the blueprints of the RS Device into nine pieces, hid one in his pendant, and entrusted the rest to a various scientist with whom he had a close relationship. A battle for the blueprints will unfold between G.O.D. and the Rider. 
==Other appearances==
===Son of Zeus===
Dr. Nanbara was mentioned in S.I.C. Hero Saga diorama story Kamen Rider X Edition: Son of Zeus.. (2011). "S.I.C. OFFICIAL DIORAMA STORY S.I.C. HERO SAGA vol.3". p. 19. ISBN 978-4-7986-0242-4.
==Relationships==
=== Family ===
Rie Nanbara.jpg|Rie Nanbara - Daughter
==Behind the Scenes==
===Portrayal===
Dr. Nanbara was portrayed by .
==Appearances==
* Kamen Rider X
**Episode 23: Kingdark! The Demon's Invention!!
*S.I.C. Hero Saga
**Son of Zeus
===Footnotes===
==Navigation==
Category:X Characters
Category:Allies
Category:Evil turns good
Category:Deceased
Category:Civilian
Category:G.O.D.