Colm is a lean, somewhat elderly man with long grey hair, greenish eyes, weathered skin, and gritty stubble on his face. He wears black trousers, a white pinstriped shirt, a patterned green neckerchief, black fingerless gloves, and a black hat with a snakeskin band. He also wears a black double-breasted waistcoat decorated with gold buttons and a gold watch chain. He used to be a cynical, calculating leader, but after the gallows in Saint Denis he is left shaken and broken. He has panic attacks.