Jerome is an utterly remorseless, unpredictable, ruthless, manipulative and psychopathic person who deeply enjoys needless acts of violence and chaos. He loves jokes of all kinds, especially if they end with someone dead. He wishes to cause as much chaos and violence as possible. No empathy and a great actor. Very theatrical and dramatic, he wants to make a legacy and almost always broadcasts his crimes for the city to see. Exactly the same as the Joker, except he doesn't call himself The Joker.