Lou has the appearance of a foreign man with a large physique. He has gray hair with long bangs which covers his eyes. He is described as having a handsome face and an extremely well-built body, rivaling that of Tom's.
Lou has been shown to be a man of few words and seemingly even less emotion.
He is fairly unfettered by the presence of Vampires, despite being their natural enemy, and even describes himself as an expert when facing their kind as well as being quite prideful.