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|This article is about a/an ally in Battle Fever J.|
Keiko Nakahara is one of two spies who work alongside Battle Fever J during their battle against Secret Society Egos. She tended to do a lot of work with the males of the team and usually was generally the female used on infiltration missions instead of Diane Martin. (though she remained significant, this role became reduced after Diane was replaced by Maria Nagisa. She is also the older sister of Masaru Nakahara.
- She was played by Noriko Hidaka, who would later voice Miss Gritta in Ressha Sentai ToQger 35 years after this role.
- Keiko was generally used instead of Diane as the main female during BFJ's first half (even though Diane was Miss America) due to the difficulty of using Diane Martin with her lack of knowledge in Japanese compared to the rest of the cast.