Supernova is a purple cosmic being with long flowing hair and a costume that resembles a galaxy with floating miniature planets surrounding her. Her eyes are really part of her powers, as they are shown leaving her face and floating above her when she powers up for combat for World-Enders killer.

Supernova is shown to be a loyal, dedicated, and heroic woman who stops evil wherever it lies. She is Alan Rails' ex-wife, the couple divorced after personal issues and due to her infidelity.