Based on available information for the OVA "Guitar o Motta Shōnen - Kikaider vs. Inazuman" and its related media, no character named "Reijiro Kontaibo" is documented. This name appears in neither voice actor credits, plot summaries, nor character descriptions associated with the production.

The OVA centers on the primary characters Jiro, also known as Kikaider, and Saburo Kazeta, known as Inazuman. Supporting characters featured include Hanpei Hattori, Miyoppe, and Saburo's unnamed high school friends possessing psychic abilities. Official sources contain no references to a character named "Reijiro Kontaibo" within this storyline or its connected works.