Room 203

A college-bound young woman who moves into Room 203 with her best friend Izzy. She is curious and determined, choosing to explore Izzy's troubled family history through a paper, even as it strains their friendship. Her resilience and quick thinking drive the moral arc as she fights to escape Morrigu's hold.

Izzy carries a troubled past linked to her mother's overdose. She sleepwalks and behaves unpredictably as the curse tightens its grip. She clings to the amulet and, despite being haunted, shows moments of resilience that help others.

A kind stranger who shares Kim's interest in journalism and uncovers the building's history. He becomes a trusted ally in piecing together the clues about Morrigu and the curse. He is killed by a possessed Izzy when he rushes to help, underscoring the danger.

The stern landlord of the building is revealed to be the baby survivor of the original tragedy. He abducts Kim and becomes possessed as Morrigu's conduit, illustrating how the past haunts the present.

Bank manager whose past actions contribute to the haunting; his wife Karen died, and his own death happened in the apartment. His history with his family ties the current events to the original tragedy.

Karen McNally, Liam's wife, who died in the tragedy. Her memory haunts the apartment as the backstory of the haunting is revealed, with her child surviving in the aftermath.

The janitor who confirms key details about the past tragedy and the surviving baby. He provides crucial exposition and serves as a link to the building's history.