Donna Troy is on Titans. It's Cassie Sandsmark who never got a shot.
Not sure where I read this, but I've started hearing that these new characters were created for TV, and DC decided to use them in their next event. I do like the idea of them creating new characters of different ethnicities to expand the diversity of their brand, even if these new characters are taking over the mantels of established characters. I'm just worried that, because they are taking over for established, popular characters, they are being set up to fail.
I think that Donna Troy's chance at the big league was when Sandra Bullock and Joel Silver wanted to make a Wonder Woman movie. I believe that Bullock was going to play Donna Troy in that movie. Even if that movie had been a flop, it would have made a bigger name for the character.