Blah blah, excuse as to why I don't upload stuff, life is moderate, newest problem is a love hexagon with a triangle inside it, etc. However, I have recently made a good lineup for the third Batman movie. That is a good thing in my book.

Riddler and Harley Quinn

The Riddler is a super-intelligent deathtrap-setter and Harley Quinn, being the Joker's psychologist, could easily be an extension of the Joker. The interesting thing about the Riddler is that he actually has a mental disorder, and isn't just a sociopath. He also doesn't believe in killing people unless necessary, which would be an amazing contrast to the ultra-violent Quinn.
I've come up with a plotline for Harley Quinn (I mixed her original motives up a bit), including her interaction with the Riddler. I could definitely see them as a good combonation. But you, whoever you may be, are already either bored or confused. And so, I bid you adue.