Jerome and Jeremiah Valeska
Jerome Valeska is broken out of Arkham Asylum for the Criminally Insane by the new villain and becomes the leader of a gang of terrorists who call themselves Maniax! and they kill the Mayor, they kill the person in charge of the Police, they massacre the police station and they steal a bus full of high school cheerleaders and try to kill them with explosives. Jerome also kills his father a blind fortune teller. Jerome kills a magician and pretends to be him so that he can try to kill Bruce Wayne. Jerome kills the other terrorists for fun once he doesn’t need them anymore and he tries to kill Bruce. But then Theodore Galavan, who broke Jerome out of Arkham, kills Jerome so that Bruce will trust him.