Futomomotarou (ふともも太郎, Futomomotarō) is a fat man that uses the Mackerel Sword sword who Jio and friends meet during the Rockbird Arc. After the time skip he is traveling with Jin. He is the "Husband" of the Zenom four guardian Spika and has been shown to have thigh fetish. Spika has a need for attention and Futomomotarou pays attention because she has nice thighs and can create food with her O-part with a simple word. He has also shown to be able to gain animal traits by eating dumplings. He also carries extra top knots for his hair. He joined the Crew after becoming Spika's husband. His O-Part is the Mackerel Sword.