Norman is a timid, 40-year-old man who runs the secluded Bates Motel. Plump and bespectacled, he spends his time reading psychology and occult books or practicing taxidermy. He struggles under the domineering influence of his mother, which causes him significant social anxiety, sexual repression, and deep frustration.

Mary is a 27-year-old woman who has spent much of her youth caring for her ailing mother and supporting her younger sister. Frustrated by her lack of agency and desperate to start a life with her fiancé, she impulsively steals $40,000 from her boss. She is compassionate but overwhelmed by the pressures of her self-sacrificing life.

Lila is Mary's younger sister, a college-educated and highly analytical woman. She is headstrong, impulsive, and deeply loyal to her sister, whom she physically resembles. When Mary goes missing, Lila becomes determined to find her, often proving more intuitive than the men assisting her investigation.

Sam is Mary's fiancé and the owner of a hardware store in the small town of Fairvale. A proud man, he carries a significant inheritance of debt from his father and refuses to marry Mary until he is financially independent. He is practical, cautious, and deeply ingrained in his small-town community.

Norma is Norman's domineering and puritanical mother. She exerts immense control over her 40-year-old son, infantilizing him and isolating him from the outside world. Her harsh judgments and extreme views dictate life at the secluded Bates property.

Milton is a private investigator hired by Mr. Lowry's firm to track down the stolen $40,000. He is persistent, observant, and determined to follow leads to their conclusion, leading him to retrace Mary's steps to Fairvale and the Bates Motel.

Jud Chambers is the local sheriff of Fairvale. He is familiar with the town's residents, including Norman Bates, and approaches investigations with a practical, small-town mindset that often dismisses the possibility of severe danger in his jurisdiction.

Mr. Lowry is a businessman and Mary's employer. He entrusts Mary with $40,000 to deposit at the bank, inadvertently providing her with the opportunity to steal the funds and flee.

Joe is a man from the past who courted Norma Bates. His involvement with Norma deeply affected Norman and remains a source of long-standing tension in the Bates family history.

Dr. Steiner is a psychiatrist at the state hospital. He evaluates complex psychological behaviors and family dynamics, bringing clinical insight to unusual situations.