Edward Nigma (Earth-1: Pre-Crisis)

"How do you know who he is? You mean Batman? Oops. Did I say that out loud? How do you know that? Oh, because a few months ago I paid a man to riddle me the answer."

- Kate Kane and Tommy Elliot

E. Nigma was a patient at Arkham Asylum and the criminal known as the Riddler.

Early life
At some point, E. Nigma adopted the codename, the "Riddler" and became a notorious criminal who operates in Gotham City.

He was later incarcerated in cell number 344 at Arkham Asylum.

Arkham Breakout
He tried to escape from Arkham when John Deegan opened his and the other prisoners' cell doors but was returned by The Flash.

Tommy Elliot
He was then paid by Tommy Elliot to tell him Batman's secret identity in the form of a riddle.

Catherine Hamilton's Speech
He was mentioned by Catherine Hamilton-Kane in a speech she was forced to read by Alice stating that people like her were the real villains in Gotham and not the Joker or the Riddler.

Powers and Abilities

 * Keen Intellect: E. Nigma was able to deduce Batman's secret identity.

Trivia

 * He knows Batman's secret identity.