Five descendants of the people showered with Bio Particles by Bio Robots five centuries in the past have become Biomen. They transform with the Bio Brace and fight using their Super Electronic Brains on their masks. Their Bioswords are equipped with sword and gun modes.

• Ryōsuke Sakamoto
• Naoto Ôta
• Akito Osuga
• Sumiko Tanaka
• Yuki Yajima
• Michiko Makino
• Yoshiko Ohta
• Munemaru Kôda