|Debut Episode/Fic||"Intro Series Part One: Double Trouble"|
|Final Episode/Fic||"No, NOT The Notebook!"|
Lily Marsh has blonde hair and a gray star on her forehead. She wears a blue buttoned coat, blue pants, black shoes, and a blue flower in her hair.
(Note: This does not describe the "Ambrosia" stories, which change up her personality somewhat.)
Lily is headstrong and tough; managing to hold her own against such people as Mr. Garrison, Wendy Testaburger, and the villian ganglie; Rayden. Sometimes, she is able to fool people into doing improper things that will benefit her, such as convincing Mr. Garrison to give the class three hours of recess. She has a twisted sense of humor, enabling her to make funny quips about taboo things such as Mr. Garrison's sexuality and his dependence on Mr. Hat. Despite her frequently shown tough and maliceful side, she has been shown to be a sweet and understanding person; as evident with her relationship with Eric Cartman. She also has been able to easy to forgive people, even managing to forgive Stan after he tried to kill her under Wendy's influence.