Black Mask is the name of two fictional Batman villains who have a black skull and a black suit who in some cases is a crime boss leader. The first Black Mask was Roman Sionis who hated masks, but he wore toxic make-up that made him to have the black skull. The second Black Mask was Jeremiah Arkham, the boss of Arkham Asylum, so after the death of the first Black Mask he wanted to continue his legacy, so he became the second Black Mask.