Jerome and Jeremiah Valeska
Jeremiah Valeska fakes his own death with the help of his sidekick Echo and has people kidnapped, enslaved and forced to tunnel out of Gotham City so that he can flood the island. He also kidnaps Bruce Wayne and mind controls Alfred Pennyworth and two people who look like Bruce’s dead parents so that he can make Bruce relive the night his parents were murdered. Jeremiah also kidnaps and tries to kill Captain James Gordon and his psychiatrist girlfriend in front of Bruce. Later on, Jeremiah and Bruce fight and Bruce pushes Jeremiah into a tank of dangerous chemicals. Jeremiah survives but ends up in a coma and stays in it for the next 10 years during which The Riddler stabbed him for fun. So as revenge, Jeremiah tricked The Riddler into escaping Arkham Asylum for the Criminally Insane and framed The Penguin for it. Jeremiah also killed Echo after she stopped being useful to him. And Jeremiah tried to kill Commissioner James Gordon and tells him his name isn’t Jeremiah anymore but something else that starts with the letter J. Then Jeremiah is attacked by a man dressed up as a bat and the Batman sends him back to Arkham.