One more char?

Exterminador./Deathstroke.

maybe dream of the endless? Since you already have death as a cameo. Otherwise prob mister miracle or orion to rep jack kirbys fourth world besides darkseid. Only other thing i can think that i havnt seen much representation could be legion of super heroes. Lol maybe you could have composite superman as a boss to!

Static Shock

Azbat..classic 90s with sharp claws shooting batarangs

Azrael? He replaced Batman temporarily and characters such as Artemis and the four reigning Supermen are in the game so I think Azrael could work.

Batgirl ou Batwoman. Ainda falta um membro feminino na Batfamília