The Bishop of Banff is a character in South Park: The Stick of Truth. He is, as his name suggests, the Bishop of Banff.
The Bishop of Banff only appears in the O Canada quest for a brief part. The New Kid is sent by the Prince of Canada to kill him and bring his balls back as a trophy so he'll release the Minister of Montreal.
The New Kid then starts a fight with the Bishop and once defeated, the bishop offers to give the New Kid some Dire Pig testicles and to say he's dead instead of actually killing him. If the New Kid agrees, he gets the Dire Pig testicles and friends the Bishop on Facebook. Otherwise, the New Kid will finish off the bishop and take his actual balls.