What about Kate Beckinsale as Talia? Though actually, Talia might need to be a lot younger than that in Gotham.
Speaking of Talia, I always thought that the best Batman adaptation after the Nolan movies would have been to do a series based on Grant Morrison's Batman comics, including the whole Batfamily of Dick…

Real friends also don't get together with guys who have abused and tried to murder their friends, but Elena still got together with the guy who tried to murder Caroline and Bonnie, not to mention her own brother.