Edward Nigma (Earth-Prime)

"Tease them with a riddle, get them all outside. What's wet and melts and isn't snow, but ends in genocide?"

- Alice quoting the Riddler

The Riddler is a former criminal and patient at Arkham Asylum.

Early Life
At some point, the Riddler became a criminal active in Gotham City, which made him an enemy of Batman. During one encounter, Batman defeated him after a stand-off with the GCPD and locked him in Arkham Asylum. He also had a daughter named Evelyn Rhyme at some point in his life.

Arkham Asylum
In 2022, Alice asked some of the inmates in the Arkham Asylum cafeteria if the Joker had ever talked about his plan to rain acid down on Gotham City. The Riddler then told her the plan in the form of a riddle: “Tease them with a riddle, get them all outside. What's wet and melts and isn't snow, but ends in genocide?”

Abilities

 * Genius-Level Intellect: According to Arthur Brown, the Riddler is a skilled wordsmith.