Thrash was a child living with her family on the streets until Sai-Fai Laboratories abducted her, maybe killed her family to leave no witnesses, and use her as a subject for Project Enersurge. Her memory was wiped beyond this point, leaving her no traces of where she came from. She would recieve the Enersurge serem, which would give her immense strength and powers, and kept in a cell at Sai-Fai Labs to test her powers, to be raised as a human superweapon. She would grow stronger with each test to the concern of staff. She started to act more wild and always wanting more combat and even pain as she grew in strength. A few years later they would find her too dangerous to contain longer, so they tried to euthanize her to no prevail, aaaand she escaped leaving havok in her wake.

Now she lives on the streets with her girlfriend, but due to the nature of what she was made her into, she would seek out and challenge other super powered beings to fight with her own powers to fufill her urge. But to her, it’s better than being contained, abused, and used for experimentation. Despite her wild characteristics, she is really caring to animals.