Jerome Valeska

Jerome Valeska is the son of Lila Valeska.

Early life
Jerome was told by his mother that his father was a sea captain named Sven Karlsen, who died while out on sea.

Killing his mother
Sick of his mother's constant nagging, especially after she had sexual relations in the room next to his, Jerome killed his mother, and was allowed by Paul Cicero to cleanup in his trailer. Jerome was then told by Cicero to scratch the initials for the Hellfire Club on the hatchet used to kill Lila, and to throw it off Arkham Bridge. Later, when Detective Gordon along with Leslie Thompkins and the circus ring master,, came looking for Lila Valeska, Jerome answered the door to the trailer, denying knowing where she was. Gordon later had Lila's snake lead the group to her dead body, with Jerome faking despair at seeing his deceased mother. At the Gotham City Police Department headquarters, Jerome was questioned by Detective Gordon on whether or not his mother had any enemies, and how he felt about her sex life, in an attempt to discern a possible suspect. Jerome was later brought back to the GCPD on the request of Gordon, who had come to the conclusion that Jerome had killed his mother, and Cicero, who Gordon had also come to the conclusion was Jerome's father, had helped him cover it up. Vehemently denying doing such a thing, Jerome later admitted to it, laughing manically, after Paul Cicero admitted to being Jerome's father. Jerome was later sent to Arkham Asylum for his crime.

Abduction from Arkham
Jerome and several others looked on as Barbara Kean walked into Arkham for the first time. He later approached her on the behalf of Richard Sionis, attempting to persuade her that a girl needed a friend in the Asylum, as bad things happened there all of the time. Though she seduced Aaron Helzinger into being her friend, Jerome brought up the point that her new friend was a "gorilla", and that his friend, Sionis, ran the place, and could get her anything she needed. Jerome was later among the six inmates knocked out by the knock out gas that came out of Zaardon's body, and abducted by Tabitha Galavan. Regaining consciousness alongside the other inmates, Jerome was formally introduced to Theo Galavan and his sister, Tabitha, with Theo offering the six inmates the chance to become a team of brilliant outlaws that would make Gotham City tremble.