Sadie is aloof and cold to most people outside the public view. She wears many faces, out of which her public persona of a charming extrovert is but one, a deceptive mask at that. In truth, she feels low self-esteem and has erected a "bubble of narcissism" around her. She is always insecure about the weight of her career due to her sudden success as a rising star. She has multiple roles, the most prominent of which is Stranger Things, as well as smaller roles like the Whale and the Glass Castle.