Juzo Inui became an over-extended Gun Slave Unit from the war. Now he works as processor and deals with issues related to extends.

Juzo is a muscular man of a medium to large build. He generally wears a tight black t-shirt under his gray jacket. He is shown to be 6ft, 6in (1.98m). His most distinctive feature is his gun for a head. His head is a revolver with the trigger and handle hanging in the back, and under it, a metallic jaw with a prominent chin. He lacks lips, instead displaying a row of hexagon-shaped teeth. His right hand also displays a gun-like appearance and can be used as one.