I created a post (link below) discussing ideas for new characters. Many people posted additional characters that they want to see. Below is a complete list so far. I will create a survey on Monday to gather feedback to provide to the devs (unless someone else volunteers). (I am sure that there are people much better at this than me.)

https://www.reddit.com/r/DCComicsLegendsGame/comments/cf2w6z/new_rework_characters_what_are_your_thoughts/

Original List: Alfred. Amanda Waller. Amazo. Anti-Monitor. Aqualad. Artemis. Azrael. Barbatos. Batman Who Laughs. Batwing. Black Hand. Bleez. Booster Gold. Captain Atom. Captain Boomerang. Circe. Clock King. Deadman. Detective Chimp. Dr Sivana. Eclipso. Eradicator. Felix Faust. Goliath. Guy Gardner. Hawkman. Hush. Impulse. Kilowog. Kite Man. Klarion. Kon-El. Krona. Krypto. Kyle Raynor. Lady Shiva. Major Force. Merlyn. Metallo. Metamorpho. Miss Martian. Movie Cyborg. Movie Flash. Movie Joker Heath Ledger. Movie Mera. Movie Scarecrow. Movie Superman. Mr Mind. Mr Mxyzptlk. Owlman. Pandora. Parallax. Phantom Stranger. Plastic Man. Red Arrow (Emiko Queen). Red Tornado. Rip Hunter. Saint Walker. Spectre. Speedy. Starman. Steel. Superboy Prime. Tempest. The Atom. The Question. The Shade. Toyman. Ultraman. Vandal Savage. Vibe. Wizard Shazam. Wonder Twins. Zoom.

Added 7/20: Orion. Lois Lane. Jimmy Olsen. Jesse Custer (Preacher). Saint of Killers (Preacher). Proinsias Cassidy (Preacher). Alexander Luther Jr. Pariah. Psycho-pirate. Cheshire. Sportsmaster. Artemis Crooks. Movie Deadshot，Movie Joker Jack Nicholson，Movie Two Face Eckhart，Movie Batman Dark Knight Bale，Movie Freezer Ex-governor，Movie Ivy Uma，Movie Riddler Jim，Movie Penguin，Movie Bane，Movie Catwoman Michelle. Dex-Starr. Sandman, Lucifer, Amenadiel. The Gray Ghost, Man-Bat, Grail, Black Mask, Pandora, Talon (Court of Owls), Talia Al Ghul, Phantasm, Ventriloquist, Spoiler, Cassandra Cain, Batman Azrael, Firefly, Catman, Mad Hatter, Black Spider, Uncle Sam (Freedom Fighters), KGBeast, El Diablo, John Henry, Grayson, Mister Terrific, Silencer Sideways, Brimstone, Damage, Jim Gordon Batman, Frankenstein, Grifter, The Reaper, Red Son Characters, Flashpoint Batman, Despero, Starro, Captain Carrot.

Added 7/22: Midnighter. Apollo. Karate Kid. Ethan Avery's Damage, Jonas Glim, Space Cabbie. Indigo-1. Jonah Hex. Ace the Bathound. Bat-mite, KGBeast, Catman. Animal Man. B’wana Beast. Black Suit Superman.

The survey is available at https://surveyhero.com/c/92938fdf.

Update 7/30

The results are available at https://www.reddit.com/r/DCComicsLegendsGame/comments/cjk5fe/new_characters_survey_results/