Lacie is part of Danville's punk scene and Vanessa's best friend. She was first mentioned in the episode "Hail Doofania!" and first appeared in the episode "Dude, We're Getting the Band Back Together". Lacie has been described as the equivalent to what Stacy is to Candace as herself is to Vanessa.
Lacie's role has evolved from that of an extra in the earlier seasons to more of a supporting role in her later appearances. She also became more animated and showed a wider range of emotions in her final appearances.