Sherlock has dark blue, wavy, shoulder-length hair that he usually has held up in a ponytail. He has similarly dark blue colored eyes. He is usually seen wearing a navy blue suit, with a white shirt with the first few buttons undone, and no tie or waistcoat.

William is a pale, lean young man with blonde, stringy hair that is medium in length with long side bangs and a prolonged side fringe. One of his most striking features are his scarlet eyes.