Chris MacNeil –  is driven to desperate measures when her 12-year old daughter is possessed by a demonic entity.

 

Regan MacNeil – sweet, innocent 12 year old who undergoes a horrifying physical and psychological transformation

 

Father Damien Karras – a Jesuit priest and trained psychiatrist struggling with a profound crisis of faith regarding his vocation and the lingering guilt over his mother’s death

 

Father Merrin – an elderly, highly experienced archaeologist and priest who is called in by the church as a last resort to perform the rites of exorcism.

 

Pazuzu – in ancient Assyrian and Babylonian demon, king of the demons of the wind, and son of the god Hanbi. Appearance:  a composite creature with a man’s body, a lion’s head, eagle-like feet, two pair of wings, a scorpion’s tail. Also known as Zu and Anzu.

 

Father Joe/Bishop (doubled) – Georgetown University President. Good friends with Father Karras

 

Burke – An eccentric, abrasive, alcoholic film director, a friend of Chris’. British.

 

Doctor Klein/Provincial Superior (doubled)– Doctor Klein – a local doctor trying to help Regan./Provincial Superior – regional leader of the local Jesuit order

 

Doctor Strong/A priest (doubled)– medical doctor attempting to diagnose Regan’s unnatural behavior./A priest.

 

Mary Karras (voice over) – Father Karras mother.