List
From Brickipedia, the LEGO Wiki
I'm keeping track of characters who appear in the DCBU section of my articles who do not have minifigures yet, but I would consider making (and then some; there are rather unremarkable characters with only a couple appearances here). It's helpful to have a list to look at when I want to make a character, but haven't got someone in mind and I thought I might as well make it public....
- Al Jabr (Other or Demon Knights)
- Alexander Luthor, Jr. (Justice League Villains)
- Amazon Soldier (Wonder Woman)
- Amos Fortune (Justice League Villains)
- Antiope (Wonder Woman)
- Athena (Wonder Woman)
- Atlantean Soldier (Aquaman)
- Arion (Aquaman)
- Artemis of Bana-Mighdall (Wonder Woman)
- Atlan (Aquaman)
- The Atom (Ryan Choi) (Justice League)
- Baroness Paula Von Gunther (Wonder Woman)
- Bat-Mite (Gotham Knights)
- Blockbuster (Gotham Rogues)
- Brainiac 5 (Superman/Legion of Superheroes)
- Bumblebee (Teen Titans/Doom Patrol)
- Carmine Falcone (Gotham Rogues)
- Cheetah (Sebastien Ballesteros) (Wonder Woman)
- Cheshire (Justice League Villains)
- The Chief (Doom Patrol)
- Chronos (Justice League Villains)
- Clock King (Gotham Rogues/Green Arrow & Black Canary)
- Crime Doctor (Gotham Rogues)
- Detective Chimp (Other)
- Detective Lance (Gotham Civilians or Green Arrow & Black Canary)
- Diane Meade (Martian Manhunter or Other)
- Doctor Poison (Wonder Woman)
- Dove (Dawn Granger) (Justice League)
- Dwarfstar (Justice League Villains)
Elasti-Girl (Doom Patrol)✓
- Exoristos (Other or Demon Knights)
- False-Face (Gotham Rogues)
- Faora (Superman)
- Fiddler (Justice League Villains)
- Fury (Wonder Woman)
- Gear (Teen Titans)
- Geo-Force (Justice League Unlimited)
- The Gray Ghost (Gotham Knights)
- The Great White Shark (Gotham Rogues)
- Hades (Wonder Woman)
- Hawk (Holly Granger) (Justice League)
- Heat Wave (The Flash)
- Horsewoman (Other or Demon Knights)
- Hourman (Rick Tyler) (Justice League/Justice Society)
- Human Flame/Inhuman Flame (Justice League Villains/Martian Manhunter)
- Humpty Dumpty (Gotham Rogues)
- Ian Karkull (Justice League Villains)
- James Gordon, Jr. (Gotham Citizens)
- Jean Loring (Justice League Villains)
- Johnny Quick (Justice Society)
- Johnny Sorrow (Justice League Villains)
- Julie Madison (Gotham Citizens)
- Kestrel (Justice League Villains)
- Killer Wasp (Justice League Villains)
- King Shark (Aquaman)
- King Tut (Gotham Rogues)
- Kite Man (Justice League Villains)
- Lady Clay (Gotham Rogues)
- LexCorp Trooper (Superman)
- Madame Rouge (Justice League Villains)
- Madame Xanadu (Other)
- Mala (Wonder Woman)
- Mento (Doom Patrol)
- Minotaur (Wonder Woman)
- Mister Terrific (Terry Sloane) (Justice Society)
- Mister Terrific (Michael Holt) (Justice League/Justice Society)
- Moxie Mannheim (Superman)
- Negative Man (Doom Patrol)
- Negative Woman (Doom Patrol)
- Ocean Master (Aquaman/Justice League Villains)
- Onimar Synn (Justice League Villains)
- Pandora (Justice League)
- Pasiphaë (Note: Pasiphaë may not officially appear in the DC Universe, but since Circe and the Minotaur do, it's likely she exists. She makes this list because I like Greek mythology, mostly.) (Wonder Woman)
- Persuader (Justice League Villains)
- Plastique (Justice League Villains)
- Poseidon (Wonder Woman)
- Professor Ivo (Justice League Villains)
- Queen Clea (Wonder Woman)
- Queen of Fables (Justice League Villains)
- Red Tornado (Justice League/Justice Society)
- Rip Hunter (Other or Booster Gold)
- The Rival (The Flash)
- Robotman (Doom Patrol)
- Roulette (Justice League Villains)
- The Royal Flush Gang (Justice League Villains)
- Sandman (Justice Society)
- Scandal Savage (Justice League Villains)
- Shadow Thief (Justice League Villains)
- Shadow Thief (Aviva Metula) (Justice League Villains)
- Shazam (Captain Marvel)
- Shining Knight (Sir Ystin) (Could end up as a replacement figure for that old Shining Knight one) (Other or Demon Knights)
- Silver Scarab (Hawkman/Justice Society)
- Spider (Justice League Villains)
- Sportsmaster (Renamed Umpire in the DCBU) (Justice League Villains)
- Static (Teen Titans)
- Starman (Ted Knight) (Justice Society)
Starman (Jack Knight)(Other or Justice Society) ✓
- Starman (Mikaal Tomas) (Justice League)
- Sting (Justice League Villains)
- Strobe (Justice League Villains)
- Sue Dibny (Justice League)
- Supernova (Other or Booster Gold)
- The Thinker (Justice League Villains)
- Tigress (Justice League Villains)
- Tomcat (Justice Society)
- Vulko (Aquaman)
- Wildcat (Yolanda Martinez) (Other)
- Will Magnus (Metal Men)
- Wizard (Justice League Villains)
- Wotan (Justice League Villains)
- Zeus (Wonder Woman)