Speaking of Injustice 1, most of the Injustice 2 newcomers make cameo appearances in some form or another.
- Robin - Nightwings alternate Regime costume is Damian Wayne
- Black Canary - Green Arrow has a picture of her in story mode (and theres concept art of her, possibly suggesting that she was going to be playable)
- Doctor Fate - his costume is on display in the Hall of Justice
- Poison Ivy - her cell is in the Arkham Asylum stage
- Mr. Freeze (premier skin) - his cell is also in the Arkham Asylum stage
- Scarecrow - hes in an Arkham Asylum stage transition and in a few of the S.T.A.R. Labs missions
- Atrocitus - hes in the background of Metropolis and in a S.T.A.R. Labs mission
- Gorilla Grodd - hes in the background of Strykers Island
- Deadshot - hes also in the background of Strykers Island
- Darkseid - hes in a Hall of Justice stage transition
Only Supergirl, Swamp Thing, Blue Beetle, Firestorm, Brainiac, Cheetah, and Captain Cold arent directly referenced in the game, though Supergirl, Swamp Thing, and Brainiac have support cards in the mobile game.