Pitching? Wishful thinking? Petitioning? Fan fiction? Whatever you'd call it, let's hear the Bat-books you wish existed.
NIGHTWING & RED HOOD
It's like "Red Hood & the Outlaws" meets "Grayson" with a stronger, more focused cast.
Dick Grayson works best when his easygoing optimism is opposite a stubborn grump — with Bruce, he was the student; with Damian, he was the teacher. Pairing Dick with Jason Todd is a perfect fit, as they're both equals at this point. They've both fully graduated from the Robin role, with completely different approaches to crimefighting and life. Dick has a balanced life with friends, love, hobbies, and he enjoys what he does. Jason is a loner, a ghost, he doesn't even legally exist since he died.
Nightwing & Red Hood work as global agents, doing Mission: Impossible-type stuff, with Tim Drake coordinating them remotely as their Oracle. I've advocated before for Tim shedding "Red Robin" bc it's a bad redundant name, and because he doesn't have a clear "thing" that justifies him as a 5th Robin, if you include Duke/The Signal.
Tim/Oracle (or a different codename — Wren?) has retired from active superheroics to pursue a Harvard education and to put his efforts into becoming a great inventor, like Elon Musk. On the side, when he's looking at his phone in class, he's also coordinating superhero missions. His fiancee, The Spoiler, does not attend Harvard, but she does live with him, and acts as Tim's local agent/protector. Across the hall is their friend, Cassandra Cain/Orphan, who also attends the school, and also acts as one of Tim's agents (but not his personal protector). Tim, Steph & Cass are all good friends and they hang out on campus. There's enough fun to be had with Tim/Steph/Cass at Harvard that they could potentially spin-off into their own book, but in this one, they are secondary recurring characters.
Basically, the students of The Bat have created their version of Spyral, but without the corruption. Nobody owns them. They undertake the difficult, sensitive missions that may fall between the cracks of other superheroes or police. It conveniently rounds up a lot of the "extra" Bat heroes and gives them something to do, while still keeping everyone easily accessible to Batman crossovers.
GUMSHOE GORDON
Jim Gordon: P.I. working with his daughter, Batgirl. It's like Veronica Mars in Gotham.
Having Gordon retire and replaced by Michael Akins was one of the best additions from the Greg Rucka era, and should be reinstated. It's more fun when the GCPD can more easily oscillate to being potentially Anti-Batman, and just as Gotham has had many mayors over the years, it too could cycle through commissioners if the story needs it.
But why would Gordon step down as Commissioner? Well you could have any kind of story contrivance to bring the new status quo — Officer Down had him getting shot, but other stories have had Gordon just retiring because he's old.
Here's how I'd do it — Barbara finally tells Jim that she's Batgirl. He always knew, but now he can't deny knowing, including that Bruce Wayne is Batman. He reasons that he can't serve as Commissioner with this knowledge, that it essentially corrupts him from serving as an ideal public official. Gordon & Bruce are finally able to be honest with each other, and after Gordon retires, Bruce supplies him with funds & technology to work privately. Gordon is an agent of the Bat, working with Wayne's technology, but as a private investigator, he's still a gritty police detective. Plus, Gordon can still serve as Batman’s police liaison, even if he's ex-Commissioner, since he still has people on the inside.
Gordon would be able to blossom into the best version of his character — more of the Year One badass, fighting police corruption. Kind of like Snyder's BatCop thing without the crazy suit. Gordon in a trench coat, with a revolver. He starts a business, and decides if Barbara is going to fight crime, it's going to be under her father's watch. Batgirl does the things that Gordon can't. And though Jim knows her secret identity, sometimes Batgirl will do things in the investigation (or her personal life) that her dad doesn't know about. So, she's still keeping some secrets from him. Or does he know those too? And is he keeping secrets from her? Father & daughter detectives. Fun!
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These two books alone could clear up the over-crowded Gotham heroe, leaving a far more streamlined cast for the remaining books:
Batman, Robin, Catwoman, Batwoman, The Signal.