Slum Queen refers to one or all of the twenty wifes of the Slum King . They first appear in Violence Jack Volume 1, Chapter 19. In which Ryu Takuma mentions that they have received special training from the King himself. At least one of them has psychic powers and can use it on a metal wire to slag people.
The Slum Queens all look similar in physical appearance and dress in identical clothing which consists of a jumpsuit, a cropped cardigan, gloves and a wide brimmed top hat. They also all have identical hairstyles, short and like that of the 1920s flapper-style.