So far We have seen Ares(now called War) Hades, Eris(now called Strife) Circe(in Men at War).
I'd like to see Cheetah and Giganta from Wonderwoman's classic Gallery.
And since Azzarello seems to like reimagining mythological characters how about making king Lycaon a wonderwoman villain. Make him the king of Werewolves.
I think we should stay with the characters that stem from mythology (or could easily be reimagined in the mythological mode). Though having Veronica Cale create a Villainy Inc style team might give non mythological villains a place in the new Universe.