So far there have been quite a few popular partnerships of Batman's deadliest foes such as:

• Riddler and Two-Face
• Joker and Harley Quinn
• Poison Ivy and Harley Quinn
• Riddler and Penguin
• Penguin and Catwoman
• Joker and Penguin
• Riddler and Joker
• Poison Ivy and Catwoman

I am sure there are more partnerships but I can't count them all. Which Batman villain partnership do you like the most? Also, this is not a ship. This is more like two rogues working together and forming some kind of bond.

My favourite is Riddler and Penguin fro Gotham! :3

Joker and herley

Personally, I'd like to see Mr. Freeze work with Penguin.

(C'mon . . . Penguin runs the Iceberg Lounge!

Why wouldn't Victor Fries want to hang out there?)

The Joker and Harley Quinn is like saying your favorite superhero team up is Batman and Robin.