My personal idea for a Batman 3 involves less supervillainy stuff and more organized crime. I see "Ossie" Chesterfield (born Oswald Chesterfield Cobblepot) moving in where Falcone left a vacuum. He runs the Iceberg Lounge. He also runs with backroom casinos including table games, sports, dogfighting and even human fighting. Then there are his "modeling and talent agencies." He's bringing classic Sinatra cool back to Gotham and despises the "greaseballs, ghetto thugs, United Nations of low-rent scum." He especially hates the "psycho-freaks" that are popping up, including Batman. He just won't say so in front of his two best men.
The man for the part? Philip Seymour Hoffman. The guy can act. He can play aloof like Capote, insecure like 25th Hour and conflicted like Doubt. Kind of like the "Nightlife King of Gotham" who has the taint of crime and the embarassing nickname of "Penguin" due to stature, build and ever-present tux. No "Penguin" pictures (a search yielded 2 billion Happy Feet posters) but I think you can see it here. Hoffman isn't comical in appearance but can play up on it through some camera angles and costume work to put him at the borderline.