Regan is a shy, creative young woman who becomes possessed by the demon Pazuzu. Regan assumes a strange, aggressive behavior that worries and scares her mother, and begins to develop progressively inhuman traits and mannerisms. Regan became an icon of horror films and a primary influence for subsequent films depicting demonic possession. The character has been spoofed in many parodies (in one occasion by Linda Blair herself), such as the Scary Movie series.