You know who would could also fit in Nolans world and they could make as Ducards successor, Red Claw. She never made it outside of BTAS. But she was a powerful terrorist and they could write her in as the new head cheese to The League of Shadows. Fun little tidbit she was voiced by Kate mulgrew.
Oh yeah, I forgot about her. I don't think she'd work in live action (like Harley Quinn), but I loved her on the show. Did anyone else recognize her as Kate Mulgrew right away in Red Claw's animated debut? I was amused that when I showed the series to a friend (it was his first time watching it), and he recognized her voice right away. I sure didn't with that endearingly cornball accent she used.