Forever Evil - Wikipedia

Harley Quinn, Arkham Wiki

Peacemaker, DC Extended Universe Wiki

Batman v Superman: Dawn of Justice, DC Extended Universe Wiki

Justice League Unlimited: Destroyer, DC Movies Wiki

Amanda Waller, Arkham Wiki

Yes, Suicide Squad: Kill the Justice League Is Definitely a Live Service Game

Amanda Waller - Wikiwand

Miracleman is probably the comic I've heard most about but never read. I did check out its history on wiki, and it's a fun ride, right down to Gaiman v McFarland. This

Damage (DC Comics) - Wikiwand

Deathstroke, DC Extended Universe Wiki