Mackenzie Bock -- nicknamed "Hardback" because he liked to read -- is a Gotham cop who partnered for a while with Renee Montoya. He was generally suspicious of Batman and didn't like vigilantes interfering with poice work. During No Man's Land, when Gotham is destroyed by an earthquake, evacuated, and cut off from the rest of the country, Bock stays behind with the police to try to deal with the chaos in the city, taking only a brief break to help rebuild his old neighborhood. After his stint with Montoya, he was promoted to the head of the Organized Crime department at Gotham City PD, and eventually Chief of Police, but upon receiving that job he basically disappeared from the comics.
Pros: The movie Gotham could use a tough, honest cop.
Cons: A fairly insignificant character, I'm not sure he even lasted 5 years as a regular in the comics.
How I'd do it: Have Bock be one of Gordon's Lieutenants.
After The Scarecrow, Ra's Al Ghul, The Joker, and Two-Face, who should be Batman's next enemy in the Batman Begins/The Dark Knight series? Well, as of now we know that Tom Hardy will play Bane and Anne Hathaway will play Catwoman.
Check out the master list for all the villains covered. I've pretty much run out by now. Obviously, there are more Batman villains, but not any of significance that I know of. As of February 2009, no one is confirmed as a villain. Not the Johnny Depp Riddler, not Phillip Seymour Hoffman Penguin, nobody.