Riddler

Bio
The Riddler is highly intelligent and as one could guess based on his name, is fond of riddles. However, this is due to some mental issues and can be seen as a weakness. For example, in Hush Riddler figured out who Batman was, but Batman made it clear he knew Riddler could never tell, because a riddle where everyone knows the answer is worthless, so the more people that know Bruce is Batman, the less valuable the knowledge is, and Nygma could never let it become less valuable.