|First Appearance||"Excretion Without Honor and Humanity"|
|Voiced By||JP: Takashi Nakamura|
EN: Ian Sinclair
EN: Cassie Cleveland
Chuck (チャック, Chakku), also known as Piggy, is the overall tritagonist of Panty & Stocking with Garterbelt. He is Panty and Stocking's pet sidekick. He resembles a green dog with zippers for ears and a tail.
Chuck is subjected to various injuries throughout the series, but is able to recover extremely quickly. Panty and Stocking in particular regularly 'kill' him without even breaking the pace of their current situation, and often take out their frustration on him with the knowledge that nothing will really affect him.
Aside from being a convenient punching bag, he is also often used as a sort of mail box by Heaven, getting struck by lightning and spitting out a clue to a ghost's whereabouts. In addition, he has been shown to be capable of driving the Anarchy sisters' car, a roofless pink Hummer H1 called See Through (シースルー, Shī Surū).
He is endowed with a more formidable power as well: by turning himself inside-out with his zippers, Chuck has the ability to transform into a colossal horned hellhound. In this form he can still regenerate from infinite amounts of abuse and fire giant fireblasts powerful enough to take out the powered-up form of his counterpart Fastener. He can also transform himself into a giant zipper that can seal Hell's Gate.
Despite those abilities, Chuck usually behaves like a very stupid dog. He is only able to say his own name (and sometimes the word 'fuck'). He seems to be very sex-obsessed, as he is often shown touching himself and humping random people.
Oddly enough, it has been shown his head is inhabited by a small red devil in a black suit who can exit through the zippers on Chuck's head, it is possible this devil controls Chuck's brain.
- Chuck's design was most likely based off of Gir, a character from the series Invader Zim, in his "disguise". 
- He's the biggest butt-monkey of the anime, he even has his own trope image The Chew Toy on TV Tropes.
- Chuck seemed generally unaware of the small demon living inside his head, for in "Chuck to the Future", he panicked when he saw the small demon.
- When Chuck is in his Hellhound form, he can shoot a green blast out of his mouth, and his face is reminiscent of Full Hollow Ichigo from Bleach.
- He has been called "Chuckles" a few times in the anime. It is unknown if this is his full first name or just a nickname adapted from "Chuck".
- "Chuck to the Future" may have just been Chuck's dream since he blacked out before the title due to electrocution.
- Despite his Pokémon language (saying his name all the time), he yells "fuck" once when he gets pummeled by Fastener to release the stone in the English dub of the 6th episode, "Les Diaboliques".
- He's probably the mascot of the anime series.
- His backstory of how he met Panty and Stocking is unknown.