Superman/Batman, Vol. 2: SupergirlJeph Loeb, Michael TurnerSuperman Post-Crisis (Jeph Loeb), book 55

Characters in Superman/Batman, Vol. 2: Supergirl

5 characters, main characters first.

Supporting characters

Supergirl (Kara Zor-El)
Darkseid
Bruce Wayne
Also in Superman/Batman, Vol. 3: Absolute Power, Superman/Batman, Vol. 4: Vengeance, Batman, Hush
Wonder Woman
Superman
Also in Superman/Batman, Vol. 3: Absolute Power, Hush, Superman for All Seasons