How about a Keneticist (overwhelming soul)? That could supply a significant amount of boom. The concept is a little weird though. He can't speak because of a birth defect. He can make noises but no articulation. Because of this he has used to music to express himself and, as part of the fluff, plays his guitar to use air kenetic blasts. He keeps a chalkboard to communicate and knows sign language so someone could spend a skill point for Lingustics to communicate with him. And I saw this great idea to have some signs ready and hold them up like Wile E. Coyote.
