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I thought about it. And thought about it some more. And the more I thought about it, the more I was intrigued. And the more I thought about Jimmy McNulty. Let me explain.
Jim Gordon is tied with Bruce Wayne himself as the oldest Batman character--which is to say, both he and Wayne are in the very first panel of "Detective Comics #27," the first-ever Batman story.
He isn't, typically, the central character, however--although he does find himself close to the action in some of the most beloved Batman stories. Alan Moore's seminal "The Killing Joke," for instance, focuses on the Joker's attempts to drive Gordon mad through horrific attacks on his daughter. And Frank Miller's iconoclastic, transformative "Batman: Year One" is often told from Gordon's perspective, as he navigates a crime-ridden, pre-Batman Gotham.