League of Assassins - Wikipedia

Suicide Squad: Kill the Justice League Spotlights Its Brainwashed Heroes in Latest Trailer

Suicide Squad - Wikipedia

Harley Quinn, Arkham Wiki

Justice League Dark: Apokolips War - Wikipedia

DC Universe - Wikipedia

Batman Arkham Games in Order, Batman Arkham Wiki, Plot, and Gameplay - News

Amanda Waller, Arkham Wiki

Justice League: The New Frontier, DC Movies Wiki

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

List of Batman supporting characters - Wikipedia