Father Damian Karras
From Heartsandminds
Father Damian Karras was struggling with his Faith when he met Chris MacNeil and her possessed daughter, Regan. Damian is brought from the end of both the book and movie, but instead of him jumping out the window, Kinderman made it inside in time to restrain him, and Father Dyer exorcised Pazuzu from him. He's been psychologically scarred by those events, and still finds some doubt in his Faith. Father Karras wont be able to leave until he comes to terms with what has happened to him and learns not to doubt God, or whatever path God places him on.
Damian is played by Shar, and his PB is Jason Miller.
His journal is at faithlesspriest