Lord Beric Dondarrion was the Lord of Blackhaven and the head of House Dondarrion. Initially sent out by Eddard Stark to lead a party of men to apprehend Ser Gregor Clegane for atrocities committed against the people of the Riverlands, he and his men then rallied deserters from different armies in the war, as well as commoners trying to defend their homes, to form a guerrilla resistance group known as the Brotherhood Without Banners, with Dondarrion as their leader. After Dondarrion died and was reanimated by the Red Priest Thoros of Myr, Beric and his Brotherhood started believing in the Red God, whom he believed to have a purpose for him. In the war efforts against the Lannisters, Beric was killed five more times and was brought back to life by Thoros each time.

Actor must be able to do a Received Pronunciation English accent with a Northern Irish lilt. Beric shows himself to be an extremely brave, determined, compassionate, noble and even somewhat civil to his own enemies. In private, Beric had a good deal of insecurity about how many times he'd been brought back to life by Thoros of Myr, whom he considered his closest friend. He admitted that every single time he came back from the dead, he lost a piece of himself as a result, including important memories of his past and his own life. He treated Arya Stark with a good deal of respect despite the fact that she was his prisoner, and stated that he greatly admired Eddard Stark and wouldn't wish his own predicament on the man