Father Dougal McGuire Linehan and Mathews to discard the mockumentary format and expand the Father Ted episode to a traditional sitcom, Father Dougal became one of the main characters. When writing Dougal, Linehan and Mathews drew on Stan Laurel, incorporating some of Linehan's own behaviour during moments of confusion. Linehan and Mathews saw O'Hanlon in a modernised Shakespeare play broadcast by RTÉ, and were impressed by the "weird, gormless" face he could pull. Linehan later said, "That was Dougal right there. He was just spot-on and he became our secret weapon. The show took off so quickly because Ardal was so instantly funny."
Father Ted Crilly of the writers' key influences was Charles Grodin's character in the 1972 film "The Heartbreak Kid". Actor Maurice O'Donoghue auditioned for the role, and Linehan felt that he was the right appearance, age and "lightness" for the character. Mathews wanted to cast comedian Dermot Morgan from an early stage, but Linehan was reluctant; he worried that audiences would confuse Ted with Father Trendy, a character Morgan had previously created for "The Live Mike". Trendy parodied a class of priests including Brian D'Arcy, perceived in the 1970s as wanting to be considered liberal and "cool", whereas Ted was written as a