I can see the Riddler appearing in the sequel and I would love that. I hated the Riddler in Batman Forever as that was just Jim Carrey being Jim Carrey. I hope the rumors that Johnny Depp will play the Riddler in the sequel are true as he is the most versatile actor in the business and he could probably pull it off.

People like Bane, Mr Freeze and the Penguin are a little ridiculous and probably wouldn't fit in the more realistic tone of the new movies.