Jerome and Jeremiah Valeska
After The Penguin is sent to Arkham Asylum for murder he meets Jerome Valeska who wants The Penguin to be the supervillain everyone says he is and when he’s not, he has everyone else attack, threaten, harass beat up and bully The Penguin to get him to show how dangerous he is. When that doesn’t happen Jerome decides to kill the Penguin but the Penguin outsmarts him, fights him, while miming, and beats him and after that Jerome starts to respect The Penguin. Later Jerome escapes with the Scarecrow, The Mad Hatter and other violent supercriminals and starts his own team called The Legion of Horribles with The Penguin Solomon Grundy, Firefly and Victor Freeze. Scarecrow creates a poison gas for Jerome that causes insanity and Jerome kidnaps the Mayor and city council and says that he’ll kill them unless his identical twin brother Jeremiah Valeska and his enemy Bruce Wayne surrender to him. Jeremiah refuses to do that until Bruce convinces him that it’s the right thing and Jerome tries to kill them both but Captain James Gordon rescues them. So instead Jerome decides to drop his insanity gas from a blimp so that everyone will be violent and insane. The Penguin then decides to tell Captain Gordon but Gordon ignores him since he doesn’t trust The Penguin.