The chief of the special science office of the National Defense Ministry. He is the founder who established the Battle Fever team to combat the Secret Society Egos.

Beyond his tactical brilliance and leadership, he is a formidable master of traditional Japanese swordsmanship.

One of the primary communications and logistics operatives who runs the Big Baser, the underwater headquarters of the Battle Fever team.

The other primary communications and logistics operative who runs the Big Baser alongside Keiko, helping to monitor global threats and coordinate the team's deployments.

Keiko Nakahara's little brother, who occasionally interacts with the team.

Tomoko Ueda's little sister. In Episode 27, she was manipulated and used by the Secret Society Egos in an attempt to locate the secret Battle Fever base.

A robotic mynah bird built by General Tetsuzan as a present for the team. Though seemingly just a quirky mechanical pet, Kyutaro often provides valuable tactical insight into the team's situations.

It was later revealed in Episode 51 that Kyutaro was also equipped with a built-in freezing ray.