Riddle us this: what cerebral criminal with an affinity for purple and green loves challenging the Dark Knight with cleverly calculated crimes and puzzling plots?

One of the Dark Knight's most infamous villains, Edward Nygma enjoys flaunting his intellectual superiority by conducting crimes and leaving clues for Batman to piece together. While this habit constantly leads to the aptly named Riddler failing in his criminal endeavors, his puzzle-problem actually stems not only from his own narcissism and ego, but also from a deep-seeded psychological compulsion. Because of this, the Riddler often finds himself a resident of Arkham Asylum following his inevitable capture.

Possessing a genius-level intellect, the Riddler creates elaborate, sometimes Rube Goldberg-esque traps, and is even willing to use innocent civilians as bait. Although not physically imposing, the Riddler's brilliance, neurosis and lack of empathy make him an incredibly dangerous foe. He cares very little—if at all—about the lives of those he uses in his plots and instead only sees them as disposable pawns in his continuing intellectual battle against Batman.