Name: Edward Nigma
First appearance: Detective Comics #140 (October 1948)
The Riddler (Edward Nigma) is a criminal mastermind who has a strange compulsion to challenge Batman by leaving clues to his crimes in the form of riddles, puzzles, and word-games. He often carries a question-mark cane around with him. He recently learned Batman's identity, but kept it a secret to prevent Ghul from learning he had used the Lazarus pits without permission.