So I liked Athanasia Al Ghul from Injustice and I think it would be interesting to see her appear in main continuity but for her to have lots of issues with not just Bruce but with Talia and I say this because I think it would be cool for instead of someone going after Bruce for someone to go after Ra's al Ghul and the League of Shadows/Assassins in the same way Batman's enemies have gone after him on multiple levels from the psychological, emotional, and physical level and for us to see Batman just get sucked into the whole mess because Damian was dragged into the whole thing to.
I mean yes I love Batman but I think it would be good to see him in a story where he's not the focus not entirely and the consequences are long lasting like the League of Assassins being permanently fractured/destroyed or something. Essentially my idea is for it to come out that Talia and Ra's tossed Athanasia aside over Damian when he was too young to remember and for the reason being that they felt Athanasia was inferior or something to Damian maybe she was born crippled, sick, or was born with mental issues that made her a pariah among the League and was locked up from her birth or something but she was still able to gain some knowledge about her family and train over the years.
Essentially I'm thinking of a Mask of the Phantasm/Hush/Red Hood type story line where some anonymous foe is targeting Ra's, Talia, and Damian (which is how Batman could get involved) using mercanaries and other famous villains as allies/decoys and for the entire arc to be about destroying and torturing the al Ghul family with a rebooted Phantasm as the antagonist. I like Phantasm because I remember a line from Batman Beyond where Bruce says to Ra's that he doesn't fear death but wimpers and that's why I think a grim reaper like foe would really mess with Ra's especially if his empire was collapsing around him and he had no idea who was doing it. At the same time I like the idea of Ra's coming to the realization that he could have had a perfect heir but because of his and Talia's actions said heir wanted nothing to do with him and would rather destroy him and create a new legacy.