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The Riddler is a minor character. His real name is Edward Nygma.
The Riddler has short black hair, dark violet eyes and light skin. He wears a green vest with a black dress shirt underneath as well green pants to match his vest and a green hat with a purple question mark on it. He also wears a purple bow tie, purple gloves, and a purple mask and black dress shoes.
He has a crush on Batgirl, which she is disgusted by.
Although he sometimes commits petty crimes, he is a member of Superhero High, as mentioned in the books.