Personally, I think it would be cool if Lobo, Vigilante (Greg Saunders) and Starbreaker were playable characters, with the latter being a boss since he is a Sun-Eater.
Sun-Eaters | Arrowverse Wiki | Fandom
The Legion of Super Bloggers! : Who’s Who: Sun-Eater
After Injustice 2, would’ve been cool had they made Nekron as the new main antagonist, and as a playable character like Brainiac or Shinnok.
Plus with The Black Lantern saga, that could result in characters like Lex Luthor or Shazam making a possible return.
Maybe even giving Atrocitus’s role in Green Lantern’s storymode from I2 to have more weight behind it, because THIS event is what he was warning Hal Jordan about during their fight in Atlantis. Turning a brief “whatever” fight, into some deep foreshadowing for Nekron’s return.
Idk, not many fighting games have ‘Grim Reapers’ on their rosters. Guy would be pretty sick.