Title says it all. Place your own Wonder Woman villain that you'd incorporate into the book if you had the chance.
The Herculeans: An organization that worships Heracles and views Wonder Woman and the Amazons as trying to destroy civilisation, much like how the patriarchs of the ancient world did. They'd be unaware of what really occurred between Heracles and the Amazons so there'd be some for some of them seeking redemption.
The Forgotten Ones: A race of gods so ancient even the Olympians don't know if them. Have returned to conquer humanity.