Batman's foe, The Riddler is Edward Nashton, also known as Edward Nigma. He is known for his green bowler hat and a variety of green clothing. The Riddler loves to lead clues in the form of riddles...
No.
Edward Nigma
there are lots check out this for some hard ones http://riddler.batbad.com/riddles/riddle_database/index.html (copy and paste it into address bar)
Nope- all the stuff about different actors possibly playing him has been proven completely false.