Rachel was one of the three main characters. And the only female character with more than two lines.
Characters can be focused on the protagonist and still have their own shit going on. Dent was running a campaign to clean up the city. Fox had a lot going on for a minor character -- the man who threatens to "out" Wayne, his dealings with the Chinese businessman, his moral disagreement with Batman. It's sad that he had more to do than Rachel, who was so much more central to the story.
Of course all the subplots will ultimately come back to Batman in a movie like this. But all the male characters all had identities, motivations, actions that made them distinct and whole within the realm of the film.
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Characters can be focused on the protagonist and still have their own shit going on. Dent was running a campaign to clean up the city. Fox had a lot going on for a minor character -- the man who threatens to "out" Wayne, his dealings with the Chinese businessman, his moral disagreement with Batman. It's sad that he had more to do than Rachel, who was so much more central to the story.
Of course all the subplots will ultimately come back to Batman in a movie like this. But all the male characters all had identities, motivations, actions that made them distinct and whole within the realm of the film.