Jerome Valeska was a deranged psychopath who grew to become a powerful crime lord in Gotham City, New Jersey. He grew a criminal empire until a series of events led to his death at the hands of Batman. His adult portrayal is heavily inspired by Heath Ledger's Joker. (Some info may be from the Gotham Wiki)
When he was young, Jerome has short red hair and a deranged smile and pale skin. When he grew up, he died his hair green and grew it out longer. He had scars on both cheeks that stemmed from the corners of his lips. He often wore white face paint and painted his lips and scars blood red and painted the areas around his eyes black.