Negative Supergirl is characterized by her dark appearance and the negative symbol on her chest. She is incredibly powerful, and she has demonstrated the ability to take on Supergirl in battle. She is also ruthless and unapologetic about her actions, making her a formidable foe.
Negative Supergirl has been a recurring antagonist in the DC Comics Universe, appearing in various storylines and crossover events. She is often seen as a dark reflection of Supergirl's ideals and values, and she serves as a reminder of the potential dangers that come with unchecked power.