Fuyuo Kawaguchi

川口 冬夫

Fuuyo is the biggest and oldest of the Machine Brothers, and is seen giving orders occasionally. He, along with brothers Akio and Haruo, make up the Machine Gun Brothers, and all are very protective of their sister Natsuko. Fuyuo's weapon of choice is a Browning M2 .50 caliber machine gun with rifle stock and forward grip.