More ideas of recurring villains for Captain Japan to fight.

This brother & sister pair are members of the robot-crime group, "BioNet". These powerful androids and the field-commanders of BioNet and loyle to their creator, Master-Brain. Eve is more human-looking then her brother and fights with a reaper-sword. She was created to be the brains of the duo and despite of her being female, she has a male's voice. Adam is built for combat and fights with brute force. He uses a katana sword and can also fly, he also has a female's voice.

They have command of the group's lower android grunts and some of their more powerful battle-robots.

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