>>150320725
You could do Brainiac, he hasn't been done on the big screen before.
You could also do Mongul and War World.
You could do Hank Henshaw/Cyborg Superman in a single film, I think, but that's probably be too complicated/too tied to death and return.
There's Imperex, who I'm not too familiar with, but I think that could work, and the Justice League is gonna be in the movie.
You could also do the Mageddon run from JLA but more superman focused (A shaggy man general Eiling would be tight.)
I also think that there is a way to do Morgan Edge and Intergang but they'd have to do it in a way that Darkseid isn't the secret end boss because I don't think the new gods will ever work outside of Kirby's stuff.
What i'd like is Metallo as the first half of the movie villain, brainiac as actual villain
(John Corben as a criminal who gets caught by superman in the opening scene, gets upgraded by a mysterious benefactor, benefactor turns out to be Brainiac.)