Lady Shiva
The League of Assassins is a huge part of the Dark Knight’s history. While I’d expect Damian Wayne, Talia, and Ra’s al Ghul to appear in a Batman movie first, there’s an opportunity to introduce Lady Shiva a little bit earlier.
Shiva’s current comic book history links her closely to the League, and this should be the same direction taken by Geoff Johns and company. As one of the fiercest fighters in the DC universe, she’d prove to be an adversary that would require Babs to improve her skills or use her brains to take her down.
I don’t know about you, but I’d absolutely love to see a female-driven martial arts film in the DCEU. Can you imagine the two of them battling along Gotham’s rooftops? It’d be a crazy exciting scene.
Clayface
Even though he’s recognized more as a hero than a villain now, Clayface began his career as a shape-shifting bad guy. He’s also one character that could benefit greatly from Whedon’s sharp writing and direction.
Moreover, the use of Clayface allows for a lot of fun (and endless cameos) in the film. Depending on the tone that Whedon wants to take, which I imagine to not be too different from the current Batgirl comic book series, the character could provide the necessary lightheartedness and humor as well. You want fun and jokes in the DCEU? Well, here it is.
He might not be considered a quintessential Batgirl villain, but he’d certainly make a terrific one. Let’s make this one happen, Joss. Pretty please?