Courtney is a twelve-year-old girl with light blue eyes and wavy blonde shoulder-length hair with long bangs framing her face. She wears white long-sleeved shirt, a pair of denim overalls, and shoes.
Courtney is frequently seen with her brother, Adrian. It is not known if their last name is "Lane" or if they use their father's surname. Furthermore, it is not known where Courtney resides in the birth order of Summer's children, or if she's younger or older than Adrian; they seem to be close in age, possibly twins.
The Teachings of Don Jake reveals that Summer's children keep running away from her. When Summer's spoken or written, she seems more irritated than concerned about this.
Adrian and Courtney run off again in Lane Miserables, heading for Casa Lane. Summer snaps at them both times she talks to them, including accusing them of "drag[ging her] to the last place on Earth I want to be."
- In The Daria Diaries, two postcards from Adrian and Courtney can be found among the collection of postcards on several pages: one from Amish Country in Pennsylvania and one from the Petrified Forest, Arizona. The first included "If you hear from Mom, tell her to chill. We'll call her in a couple of weeks" and the second included: "We're saving up, and we'll probably be home for some holiday. Say hi to Mom."