Ethan played "The Bass Player" in "That Thing You Do". He had no name. It was just "The Bass Player
He also played Preston Myers, a graduate of Huntington High School who is trying to get a girl that he's liked since his freshman year, to notice him in "Can't Hardly Wait"
Pictures of Ethan in as Mark, a worker at a music store called Empire Records. (He was called Ethan Randall when this movie was made.)