Fuyuo Kawaguchi

Fuyuo Kawaguchi is the eldest member of the Machine Brothers and holds authority over the group, occasionally issuing commands to his siblings. He is part of the Machine Gun Brothers alongside Akio and Haruo, and together they share a strong, protective bond with their sister, Natsuko. Fuyuo uses a Browning M2.50 caliber machine gun, a choice that reflects his role as a protector within the family.