Agreed! Him, or Shadow Thief would be very cool!

I'd love to see the Spectre. I just stumbled onto him in my wiki-education of the DC universe, and I'm loving what I'm reading.

I'm also really loving Saint Walker the Blue Lantern. He's not your definitive badass, but he's hella interesting.

when it comes to green lantern villains id suggest the following

atrocitus ( red lantern)

major force

black hand ( first black lantern)

sinestro


superman villains

braniac
zod ( he is in the new film)
dooms day

the flash

captain cold

Rag Doll

the top

Weather Wizard

martian manhunter villains

white martian

Malefic

Fernus

Doctor Polaris would be a cool future game character too. He is after all DC's Magneto.