Jack Napier

Jack Napier was a gangster who one day killed a couple and ran away. Later he worked for Grisham the Leader of the Gotham Mob. Grisham betrayed him. Bullock as well but Batman came. He killed Bullock. Later he fell in toxic chemicals. He was considered dead but he came back with green hair and white skin like a clown. Batman later discovered that Napier is responsible for his creation. Jack Napier later called himself The Joker.

Napier was the name of the actor who played Alfred in the old Batman series. With Jack Nicholson you have Jack Napier.