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List of Pretty Little Liars characters. (Redirected from Mike Montgomery (Pretty Little Liars)) The main characters of Pretty Little Liars (From left): Troian Bellisario as Spencer Hastings, Lucy Hale as Aria Montgomery, Shay Mitchell as Emily Fields, and Ashley Benson as Hanna Marin. The ABC Family teen drama Pretty Little Liars is based on the series of young adult novels by Sara Shepard.