Black Star was what was once termed a "gentleman criminal", in that he does not commit murder, nor does he permit any of his gang to kill anyone, not even the police or his arch enemy Roger Verbeck. He does not threaten women, always keeps his word, and is invariably courteous, nor does he deal with narcotics in any of his stories. He is always seen in a black cloak and a black hood on which is embossed a jet black star. The Black Star and his gang used "vapor bombs" and "vapor guns" which rendered their victims instantly unconscious, a technique which pre-dated the Green Hornet's gas gun by several decades.