Emily Ovittz is the main character who suffers from PTSD after the murder of her parents. She is inspired by the character Charlie from "The Perks of Being a Wallflower" who also has PTSD. Emily wears white pajamas and socks as symbols of her lost innocence and relationship with her father.
The stalker pursuing Emily is dressed all in black to represent darkness and filmed in shadows to create suspense. Inspiration comes from the mysterious killer Bill in "Kill Bill" who is never fully revealed. Through effective lighting and shadows, the stalker brings a sense of impending doom.