Emily Catherine Fields is a fictional character created in 2006 by author Sara Shepard. She is a character in both Pretty Little Liars' books and television series, and initially appears as a "jock girl" and one of the main protagonists of the story. She is part of the group known as the Liars; and is best friends with the four other members, who are also protagonists. Emily is known for her description and shyness, as well as for being part of a conservative family, the Fields.

Alison Lauren DiLaurentis is a fictional character in the Pretty Little Liars book series, its television adaptation, and the spin-off series Pretty Little Liars: The Perfectionists. The character was created by American author Sara Shepard.