In "The List", Nelly's first appearance, Butters is told to kick her in the "balls" by the other boys, only to have his arm broken.
Nelly views Butters' video in "Canada on Strike!".
During the twentieth season as the Gender War unfolds, Nelly is chosen as the leader of the Girls in fights, due to her tough attitude, while Butters becomes leader of the boys as he begins the #WeinersPut movement. The two nearly fight in "Douche and a Danish", but are later seen working for charity together.
There are very few fanfictions that include this pairing, but there are a few fanarts that include it,
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