Edward Nigma (Earth-6531)

"You came after me, you know? Not the other way around. I made you hurt an innocent woman to get to me. My comrades would've been impressed. I set this all up to show them...I thought they'd back me up, even if they didn't agree. They--they left me to deal with you alone. They--they betrayed me. They didn't come. They were all so small minded. None of them had vision! Unless...unless that white faced prick set me up...never told them to meet me here!"

- - Riddler to Batman

Early Life
The early life of Edward Nigma is shrouded in mystery. What only is known is that he was once an agent of S.H.I.E.L.D. by the name of "Edward Nashton". As an agent, Nigma was subjected to the top-secret Project T.A.H.I.T.I., which changed him from a normal man into a narcissistic and psychotic mastermind.

Gotham Criminal
Nigma, now going by the name Riddler, became a criminal mastermind in Gotham City during its rule by Thomas Wayne, Hamilton Hill and Carmine Falcone. His crimes consisted of a series of serial killings with puzzles being its core themes. Once the trio of criminal lords attempted to take him down, the Riddler simply disappeared, which led to the public believing he died.

During the time of his disappearance, the Riddler invaded Peña Duro at Santa Prisca, murdering its warden. This attracted the attention of S.H.I.E.L.D. Director Nick Fury, who made his objective take him down. Almost succeeding in Sudan, Fury lost his track after the Riddler had already gone.

After this event, Riddler became an ally of Catwoman, hiring her to steal from the Louvre. However, the masked thief was almost captured by Wonder Woman while escaping from the police in Paris. Although Catwoman stated her life was not worth jewels for someone else, she ultimately chose to continue helping the Riddler duo to his payment.