 To avoid the biblically toned dialogue from sounding too "campy", Collins does his best to "play it as real as possible".Because Castiel's true voice shattered windows in his premiere episode, Collins decided to use a "gruff, resonant voice" for the character.However, when portraying the angel's host Jimmy Novak, he tried to create a distinction between the two characters, providing different physical and personality traits, as well as using a "more boyish kind of sound" for Jimmy's voice.