Demonic possession, exorcism, main character(s) a bit of a rebel/outcast, traumatic past. "Priest" offers the added element of a "Leverage"-type (U.S. series), secret group of experts working behind the scenes bucking the system.

Demonic possession, exorcism, main characters who are outcasts, Master & apprentice, Good v. Evil, childhood trauma.

Demonic possession, exorcism, personal sacrifice for the greater good. "Priest" has the additional element of a "Leverage" (a U.S. series)-type, undercover/secret team.