Luke is described as a tall, college-aged young man with an athletic, muscular build. He had short-cropped sandy blonde hair, blue eyes, a sharp nose, and the sneaky look like all Hermes demigod children. Many girls found him particularly attractive, even the Empousa Kelli. The only thing unsettling about Luke's appearance was a thick, deep pale scar that ran from the bottom of his eye down to his chin caused by Ladon, the guardian dragon of the Garden of the Hesperides.

