Gozu (牛頭 Gozu) is a giant Marine Commander who oversees G-6's swamp unit; a faction of G-6's Marines that are stationed in the marshes of Sheol and specialize in swamp warfare. Along with his brother Mezu, he and Gozu are referred to by their fellow Marines as G-6's "gatekeepers." A term meant to indicate the two brothers as the base's first line of defense against outside threats. Like Mezu and Damon, Gozu came under the influence of G-6's stored chemicals, which radically warped his appearance and modified his physical performance.