Harold was an acquaintance of Jack Harkness. He preferred to stay incognito and never gave Jack his real name. Harold was of a humanoid species, but unnaturally pale and thin, with no hair, grey, slitted eyes and dark green tissue. He wore fancy, old-fashioned clothing, including a long black jacket, a top hat and black gloves. He was also a smoker. Like Jack, he worked as a conman.