Leslie was one of the geniuses who worked for the Apple Store in the episode "HUMANCENTiPAD" and helped get Kyle back from Apple's headquarters. Having not read the Terms & Conditions, Kyle was taken to Apple's HQ to become a part of the HUMANCENTiPAD. Stan Marsh and Gerald Broflovski went to the Apple Store to speak with a genius to undo the contract. Leslie had a "quickening" with the other geniuses as was able to undo the binding of the contract.
Leslie had brown hair with subtle gray highlights. She wears traditional Apple Store employee attire; black pants, a blue shirt with a white atom logo, and a white Apple Store employee badge hanging from her neck. Leslie is slightly overweight.