When I compare the current Wonder Woman run to Lady Death, I thought I'd say a few words about the character and why I think this is a real possibility.
The version of Lady Death that's freshest in mind is actually the one from the Lady Death direct to DVD animated film from 2004. This film is mildly entertaining, though it pales in the face of any of the DC direct animated films. It differs from the character that was published in the 1990s, that originated as a pinup for Evil Ernie but was later given a story, mostly by
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turning Lady Death into a heroine of sorts.
Spoilering this in case you haven't seen it and want to.
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Medieval Sweden. Hope is the daughter of a local warlord. Hope's love is Niccolo, a student. Her dad is Matthias, who constantly needs to conscript people into his army to fight some war whose nature is not explained.
Unknown to his innocent daughter, Matthias had a dark secret. Matthias was outwardly pious, but secretly dabbled in black magic and demonology. He was actually a descendant of the fallen angels who had led the rebellion against God. By contrast, Hope's mother was a woman so pure and innocent that her bloodline reached Heaven. Hope's mother died when Hope was still in her late teens, and she was left to live with her father.
Eventually, Matthias' cruelty triggered a peasant uprising. Matthias narrowly escaped death at the hands of the rebels by summoning a demon, but Hope was captured by the rebels and accused of witchcraft. While she burns at the stake, Hope strikes a bargain with a demon that appears and is poofed to Hell. There, she learns that Dad's in charge down here too, because Matthias was in fact Lucifer, the ruler of Hell. Dad's got Niccolo in Hell; that's expected, he was a humanistic student of science. Dad's also got saintly Mom's soul in Hell too; damned if I know either. Dad offers Hope a place by his side; she refuses, and is cast out from Lucifer's digs into regular Hell, which is more or less what you expected.
In Hell, Hope beats back a pack of hellhounds, and this bit of spunk commends her to a weaponsmith called Cremator. He trains her in swordsmanship. She declares that Hope is no more; henceforth she is Lady Death.
This leads to a standard quest where she must acquire a magic sword and flying steed, defeat various demon lords, and ultimately muster an army for a rebellion against Lucifer. This, of course, leads to the climactic battle. She learns, however, that her curse is to remain in Hell for as long as one of Lucifer's allies remains alive.
Yes, this reminds me very strongly of Azzarello's story so far, where Diana is essentially mustering an army to challenge the gods. And it actually isn't a bad story. And it's one of the reasons why I think that Diana will end up in some kind of long term relationship with Hades or his domain. If you're going to give a hero a dark side or a villain a bright side, this is a way to do that. And I continue to believe that it is DC editorial policy to darken Diana, her environment, and her character.