Edward Nigma, aka the Riddler, is the Batman's most intelligent foe and one who leaves behind clues to his crimes--taunting the dark knight to catch him.
The Riddler was an interesting character to build. Due to his costume design, I had to use a large number of stickers for question marks--which here are slightly modified and cut stickers from the Riddler Chase set. His face was difficult to design too. His base design is shaped like a large question mark.