Which Batman villain do you wish had been brought to Nolan's movie universe?

Well you could debate it, but it looks as though Christopher Nolan is done making Batman films (though if you’re familiar with the grouping of graphic novels he pulled a lot of source material from, he’s given himself a way to make more—or just an outright Nightwing movie—but that’s another topic…). Personally I was pretty distraught that we would only see 3 movies all together, as there is so much potential to make the various Batman villains into gritty-real-world villains.

That got me thinking, which Batman villain/s would you have liked to see in the Nolan universe? Early on in the production of the last two movies there were rumors that we would see the Penguin (Philip Seymour Hoffmann was the supposed leading candidate) as an international arms dealer. There were rumors that Edward Nigma, aka the Riddler, would be brought in by the Gotham Police Department to hunt down Batman for the crimes he took the fall for at the end of the Dark Knight (Studio execs supposedly wanted Dicaprio for the role, even suggesting it to Nolan). There was even a rumor that Doctor Strange might make an appearance in the 3rd film, with none other than Robin Williams being considered for the part.

The Mad Hatter, Black Mask, The Penguin, The Riddler, Dr. Strange, Harley Quinn? It would’ve been especially interesting to see Nolan’s take on the more “supernatural” villains like Mr. Freeze, Killer Croc, Solomon Grundy, or even Poison Ivy. Who would you have like to have seen in a gritty real world universe.