Nancy is a one time character in the animated series South Park and appeared in the Season 8 episode, Up the Down Steroid as Jimmy Vulmer's new girlfriend. Her name might be a reference to Nancy Kerrigan an American figure skating olympian. This is possible due to the fact Nancy Kerrigan was mentioned in Damien.
Appearence
Nancy had short black hair, held back with a teal headband, and dressed in a more 'mature' manner than the other girls, wearing makeup and a navel ring (unusual for her young age), as well as a midriff-baring black shirt with yellow stripes running down the sleeves, and a pair of teal pants (also with yellow stripes).
Relationships
Jimmy
Nancy was Jimmy's girlfriend in Up the Down Steroid, they met in a free period at school, and they got on quite well as boyfriend/girlfriend even after Jimmy beat her up. She still rooted for Jimmy at the games though.
To date she has only made in appearence in Up the Down Sterood.