Roman Beauvais Sionis was the wealthy owner of the Black Mask Club while operating as the frightening crime lord known as the Black Mask
Said to be an absolute narcissist and a homicidal psychopath. He is also highly ambitious, power-hungry, sadistic, and emotionally unstable. He is also highly misogynistic and seems to see women mainly as objects for his use and amusement. He revels in violence, and can easily lose his temper when things do not go his way. 