Tank
>Supes
>Lex (make him a D.Va clone)
>Doomsday
>Bane
>Cyborg
>Ares
>Black Adam
>Swamp Thing
>Grodd
>Killer Croc

DPS
>Wonder Woman
>Red Hood
>Starfire
>Beast Boy
>Green Arrow
>Green Lantern
>Black Canary
>Flash
>Deadshot
>Nightwing
>Deathstroke
>Constantine

Support (ideally this game would have regeneratong health and suppports would only focus on intel, cover fire, or buffs)
>Batman
>Scarecrow
>Poison Ivy
>Aquaman
>Martian Manhunter
>Raven
>Zatanna
>Dr Fate
>Joker
>Krypto