Stacey Pilgrim (b. December, 1984)[1] is Scott's 19-year-old (20 in Volume 6) younger sister. She works at the same Second Cup with Julie Powers and is also friends with Ramona. She's based on, and named after Bryan Lee O'Malley's real sister Stacey. She sometimes calls Scott her little brother, probably because she is more grown up and mature.

She has no problem interjecting her opinions and morals into Scott's life. She apparently keeps up via Wallace's texts, so they could be considered friends, though she sometimes expresses bitterness to Wallace when he constantly steals her boyfriends.