Riddler

The Riddler's criminal modus operandi is so deeply ingrained into his personality that he is virtually powerless to stop himself from acting it out (as shown in his fourth comic book appearance). He cannot simply kill his opponents when he has the upper hand; he has to put them in a deathtrap to see if he can devise a life and death intellectual challenge that the hero cannot solve and escape. However, unlike many of Batman's themed enemies, Riddler's compulsion is quite flexible, allowing him to commit any crime as long as he can describe it in a riddle or puzzle.

After a teacher announces that a contest will be held over who can solve a puzzle the fastest, a young Edward Nigma (or Nashton at the time, according to some writers) sets his sights on winning this, craving the glory and satisfaction that will come with the victory. He sneaks into the school one night, takes the puzzle out of the teacher's desk, and practices it until he is able to solve it in under a minute. As predicted, he wins the contest and is given a book about riddles as a prize. His cheating rewarded, Edward embraced the mastery of puzzles of all kinds, eventually becoming a carnival employee who excelled at cheating his customers out of their money with his bizarre puzzles and mind games. He soon finds himself longing for greater challenges and thrills, and dons the guise of the Riddler to challenge Batman, who he believes could possibly be a worthy adversary for him.




Two-face

Eventually, in Arkham, the doctors in the asylum attempt to wean him off the coin by replacing it with a die and eventually a tarot deck, giving him 78 options. The treatment fails due to Dent being unable to make decisions. Batman returns the coin, telling him to use it to decide whether to kill him. He tells Batman that the coin landed scar face down, and Batman leaves safely, but the next scene shows the scar face up, meaning that he inexplicably chose to let Batman live due to it being April Fools' Day.[11][12]