What origin would you give Donna Troy in Rebirth?
Donna Troy has been a big question ever since the Finches reintroduced her during their run on Wonder Woman. She was a mysterious Amazon with a body of clay, only related to Diana by the fact that her genes were effectively the same as Hippolyta's, and was ostensibly a villain that was meant to take the role of the Queen of Amazon's from Diana by the villainous Derinoe - the problem was, where had his Donna come from? Derinoe's dialogue within the series implied that she was basically a newborn, even going so far as to use a newborn Amazonian baby in her creation, but given the other Amazon's familiarity with her this couldn't have been the case.
And now, we know that what happened during the past two runs of Wonder Woman were "lies." The Themyscira that was introduced in Azzarello's run and introduced the concept of Diana as queen was a lie, and it did not truly exist in the same capacity as the true Themyscira - something that we were introduced to during the Year One storyarc by Greg Rucka with art by the wonderful Nicola Scott. Donna, however, was not a lie. We've already seen with her inclusion in an upcoming miniseries that neither was Hessia, but her origin is being hashed out for the first time. Donna is a big question mark though; who is she and what is her connection to Diana? At least part of this will be cleared up in the Titans annual, but that's a few months away from now. So a question: how would you explain Donna Troy?
For me, it's actually kind of simple. Diana came to Man's world about ten years ago, and we haven't seen her ENTIRE life during Year One - so just do the easy thing and make it so that Donna Troy is the younger sister of Princess Diana of Themyscira; Donna of Themyscira, second daughter of Hippolyta, adopted if not through their genes. She's a few years younger than Diana, but the gap isn't as large as it would appear in current continuity. Donna looked up to her older sister Diana, and when she left the island of Themyscira, she was heartbroken. Against her mother's wishes, five years after Diana left Themyscira, a sixteen year old Donna left as well, and headed for Man's World. When she got there, her nearly identically aged sister was now seven years older than her as opposed to the usual two.
She decides to start fighting crime with Diana, in Diana's honor, as Wonder Girl. She joins up with the Teen Titans. The rest is, as they say, history.