I have plans and ideas for reincorporating so many Wonder foes and Amazon adversaries into Diana's world (as well as several new ones), it's ridiculous:

Ares
Cheetah
Circe
Doctor Psycho
Giganta
Doctor Poison
Angle Man
Eviless
Villainy Inc.
Ares' Children
Duke of Deception
Lord Conquest
Earl of Greed
Medusa
Heracles
Doctor Cyber
Godwatch
Queen Clea
Gundra the Valkyrie
Dark Angel
Veronica Cale
Inversion
The Mask
Superwoman
Devastation
Silver Swan
... and quite a few more.

Diana has so many good villains with great concepts behind them that have never been developed. It's an absolute shame they've been forgotten or marginalized before they could ever be used.