This villain exists in the Gotham, the city that Batman lives in. The Riddler is obsessed with riddles, puzzles, and word games. He delights in forewarning both Batman and the police of his capers by sending them complex clues. With this self-conscious use of a gimmick, the Riddler's crimes are flamboyant and ostentatious. The Riddler is always dressed in green and question marks.