Been trying to figure out both Villains Month and Forever Evil in my head, partly because I haven't been up to date with the titles, but I figured I'd try to make a list of who's who on here so I and everyone else knows which baddies will be in what books and what's been confirmed thus far, and I'll update this list (complete with covers) when I know anything new.
AN: Many series appear to be getting groups of villains in weekly issues, some of which are villains connected to other parts of the Super Hero family in question but appear to be getting issues within the core titles. This is epically true for the Batman titles, owning to his impressive Rogues Gallery. It has been confirmed some series will not get an Villains Month issue.
So I believe we have the following which get villain counterparts:
Justice League Books
Justice League - Darkseid, Lobo, Dial E, Secret Society
Justice League of America - Deadshot
Aquaman - Black Mantra/Ocean Master
Flash - Gorilla Grodd/Reverse Flash/The Rogues
Green Arrow - Count Vertigo
Wonder Woman - First Born (Circe? Ares?)
Earth 2 - Desaad/Solomon Grundy
World's Finest - ?
Vibe - ?
Katana - ?
Batman - Joker/Riddler/Penguin/Bane
Batman: The Dark Knight - Ventriloquist/Mr Freeze/Clayface/Joker's Daughter
Detective Comics - Poison Ivy/Harley Quinn/Scarecrow/Man-Bat
Batman and Robin - Two Face, Court of Owls, Ra's Al Guhl and the League of Assassins, Killer Croc
Nightwing - ?
Batgirl - ?
Birds of Prey - ?
Catwoman - ?
Batwing - ?
Batwoman - ?
Talon - ?
Red Hood and the Outlaws - ?
Action Comics - Cyborg Superman/General Zod/Lex Luthor/Metallo
Superman - Bizarro, Brainiac, He'l, Parasite
Superman Unchained - ?
Batman/Superman - ?
Supergirl - ?
Superboy - ?
Green Lantern Books
Green Lantern - Relic
Green Lantern Corps - ?
Green Lantern: New Guardians - ?
Red Lanterns - ?
Larfleeze - ?
Young Justice/The Edge Books
Teen Titans - ?
All-Star Western - ?
Stormwatch - ?
Suicide Squad - ?
The Movement - ?
The Green Team: Teen Trillionaires - ?
The Dark Books
Animal Man - ?
Constantine - ?
Justice League Dark - The Creeper
Swamp Thing - Arcane
Trinity of Sin: Phantom Stranger - ?
Trinity of Sin: Pandora - ?
Current Total: 41?/52 Confirmed Titles
Forever Evil Books (Starts in Sept, Continues over 7 Months)
Forever Evil #1-7
Forever Evil: A.R.G.U.S. #1-5
Forever Evil: Arkham War #1-5
Forever Evil: Rogues #1-5