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Scanty and Kneesock's version of Chuck.
Fastener is the pet sidekick of the demon sisters, Scanty and Kneesocks, as well as the evil counterpart of Chuck. He is a pink/red color with light green eyes and a zipper going down his rather angular-shaped head and another one around his neck, much like a collar, with pointy, short black limbs. Unlike Chuck, Fastener is more competent in his work with the demon sisters, although he is still subject to various pains and injuries.
Like Chuck, he also only says his name and also drives the demon sister's transport, a Limo G-Wagen SUV called G-String. Fastener apparently has a history of rivalry with Chuck, dating back to their college days.
There is a small red female devil in a black suit living in Fastener's head, who is romantically interested in Chuck's devil. Similar to Chuck, Fastener can also transform by zipping himself inside-out, but appears as a two-headed dragon.