Two Face had to be in TDK if that story was going to work at all ... The story is centered around the different ideals regarding justice that he and Batman represent. The Joker was there to try to show justice can be corrupted. All that being said, I may be misunderstanding your point. If you are saying you wanted a completely different story, I can see that, but the story as-is required all of the characters that were in it (the main characters, at least).
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