I'd love to see a Green Lantern film animated or live action, to be this detective other-worldy kind of film. The one thing I loved when I watched Star Wars: The Clone Wars, was when there was a detective mystery going on in this noir space city. Pretty much, "Blade Runner" but with power rings haha. Still would be nice.
I was thinking, what if they made a new and revamped DC Animated Universe for the streaming service? It'd be a really good killer app, because after the original DCAU ended it kind of left a void the others couldn't fill. With this, they could do a brand new story with interconnected plot lines, more mature themes (not that the DCAU couldn't get mature, but it still had to work in the confines of being on a kid's network), and aspects of the DCU that weren't covered by the DCAU in its original run, or were introduced since then.
Some show ideas:
Batman Inc. - Adapts Batman Incorporated from the comics. Instead of focusing on Batman exclusively (though he'd certainly get his share), we see how Batman's organization of Batmen operate across the world. Characters include Nightwing, Red Robin, Batgirl, Robin, Batwoman, Orphan, Spoiler, Batwing, Talon, Dark Ranger, Nightrunner etc. Some episodes focus on Batman, some focus on the others, some focus on them working together.
Teen Titans - Sadly, a complete return to the old series looks impossible, but what if they incorporated a new Teen Titans into a new DCAU? They could utilize members of the team that may have appeared but weren't part of the main roster in the 2003 show, like Kid Flash, Speedy, Bumblebee, Wonder Girl, Hawk and Dove, Blue Beetle etc.
Red Hood & The Outlaws - Red Hood forms his mercenary group with Arsenal and Starfire, and fights as an anti-hero team taking on numerous operations, while other characters join or work with them.
Suicide Squad - Expendable and deniable supervillains are put on suicide missions by the government in exchange for commuted sentences. We can expect the regulars, like Deadshot and Captain Boomerang (and Harley Quinn, probably), and this would be the chance to show us the darker side of the DCAU. It'd probably be a lot more fun than the 2016 movie, too.
Justice League - Of course, there's the Justice League. They're the premier superhero team, and take on all threats to Earth. Like Unlimited, this would be a perfect chance to show off some lesser-known characters.
Justice League Dark - JL's paranormal division, with Constantine and Zatanna as the main characters and a variety of side characters like Deadman, Etrigan, Swamp Thing, Madame Xanadu etc. involved. They deal with the mystical and supernatural side of the DC Universe. I know they made an animated movie, and are working on a live-action movie, but this could easily be a show too.
As you can tell, I want lesser-known characters to have limelight.