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You shtaring at my neckbrace?!
~ Shelly Marsh
Shut up, Turds!
~ Shelly Marsh
Shelly Lynn Marsh is a recurring antagonist of South Park. She is the daughter and eldest child of Randy and Sharon Marsh, the older sister of Stan Marsh, and is often portrayed as a violent bully, though on rare occasions she can show a kinder side; though this seldom lasts long.
Shelly is named after, and based upon, Trey Parker's older sister, Shelly Parker.
Stan is Shelly's younger brother. She used to beat him up much of the time, but was not seen doing so for a time. She did start punching him repeatedly in "Over Logging", however, when she thought of how her online boyfriend might worry for her if they could no longer e-mail each other. To date, this episode is the only instance in which her violence towards Stan is noticed by their parents, as Randy then runs over and tells Shelly to calm down. Shelly and Stan may have resolved their sibling rivalry, as Shelly has not shown any violence towards Stan since "Over Logging". In "PC Principal Final Justice", she threatens to shoot Stan, blaming him for Randy and Sharon's disregard for her, in favor of him.
Sharon is Shelly's mother. Of all the grownups in the family, Sharon seems closest to Shelly. In Season 1, Sharon doesn't care if Shelly abuses her brother Stan. In "Over Logging", however, Sharon forces her daughter to turn off the computer. In California, she scolds Shelly for snatching Stan's tickets.
Randy is Shelly's father. He is usually seen interacting with Stan, but he and Shelly have spoken to each other several times. She was frustrated by Randy recording ridiculously everyday family antics, saying "Turn it off, Dad!"
Roy was Shelly's step dad. After Sharon divorces Randy in "Clubhouses", she stays with Roy. They stayed together until Sharon dared Randy to have sex with her and they make up.
Shelly is similar to Sarah from Ed, Edd n Eddy as both are the sister of one of their shows main characters (Stan and Ed). Both have a poor relationship with their brothers and will act violent towards them whilst acting sweet and innocent to their parents.
Shelly is also similar to Terrence from Foster's Home for Imaginary Friends, as both are older siblings and bully their younger siblings.