Nin-Nin is a midget ninja who is always hooded. He is Miko's loyal, yet sexually perverted, companion and sidekick. He likes to peep when Miko is bathing or masturbating and beams with joy whenever he can see her naked, or barely dressed, or in any troublesome sexual encounter with demons or other ninjas. On the other hand, he is very much in love with her and always helps her out when she's in trouble.