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Main

 * Darby Stanchfield as Nina Locke, the Locke family matriarch who moves to Keyhouse with her children following the death of her husband
 * Connor Jessup as Tyler Locke, the Locke family's eldest son
 * Emilia Jones as Kinsey Locke, the Locke family's middle child and only daughter
 * Jackson Robert Scott as Bode Locke, the Locke family's youngest son
 * Petrice Jones as Scot Cavendish (seasons 1–2; recurring season 3), a British student filmmaker at Matheson Academy, leader of the Savini Squad and Kinsey's love interest
 * Laysla De Oliveira as Dodge (season 1, guest seasons 2–3), the "well lady" of Keyhouse who is revealed to be a demonic entity
 * Griffin Gluck as Gabe (seasons 1–2; guest season 3), Dodge's male persona who poses as a student at Matheson Academy
 * Aaron Ashmore as Duncan Locke (season 2, recurring seasons 1, 3), Rendell's younger brother who used to live in Keyhouse
 * Hallea Jones as Eden Hawkins (season 2, recurring season 1; guest season 3), Jackie's best friend at Matheson Academy. She is possessed by a demon at the end of the first season.
 * Brendan Hines as Josh Bennett (seasons 2–3), the history teacher at Matheson Academy and Nina's love interest. He is also a descendant of Frederick Gideon.
 * Kevin Durand as Frederick Gideon (season 3, recurring season 2), a captain in the British Army during the American Revolutionary War who was the first person to discover the portal behind the Black Door and become possessed by a demon. At the end of the second season, he is summoned to Earth as an echo by Eden.
 * Sherri Saum as Ellie Whedon (season 3; recurring season 1; guest season 2), the physical education teacher at Matheson Academy, an old friend of Rendell's and one of the former Keepers of the Keys
 * Coby Bird as Rufus Whedon (season 3; recurring season 1; guest season 2), Ellie's adopted son and the groundskeeper of Keyhouse who befriends Bode. He is fascinated by the army and weapons.