4. Calendar Man
Fans of The Long Halloween, a 13-issue comic book series based around Batman's early crime-fighting days, will know exactly what I am alluding to with Calendar Man's inclusion here. Calendar Man is a vicious criminal who carries out his crimes on specific dates that have a special meaning, such as Christmas and Halloween. Whilst some heroes and villains saw him as a joke due to the petty nature of his crimes, in The Long Halloween Calendar Man takes on a much more sinister role, helping Batman to track down Holiday, a killer who kills on specific major holidays, similar to Calendar Man himself. Calendar Man talks to Batman from his jail cell much like Hannibal Lecter in The Silence Of The Lambs, something which could have given the trilogy a much scarier edge, although I would have personally liked to see him help Batman to understand the mind of the Riddler rather than have the inclusion of Holiday in the film too. The fact that The Long Halloween also features a power struggle between the Falcone and Maroni families means that it could have fitted into Nolan's world nicely, especially as Two-Face was one of the major suspects for the identity of Holiday in the series, so maybe he could have been included after all. Whatever route was taken, it would have been great to see Batman grappling with whether he really needed to ask the help of a psychotic killer in order to help catch another, something we don't see him confront in the trilogy, although he does go some way towards criminality himself upon breaching Gotham's privacy with the sonar machine at the climax of The Dark Knight, although that was, of course, a necessary evil.