I once was an enterprising researcher at Crey Medical Technologies. My team was involved in finding a method to perform "chemical tonsilectomies", ie, no surgery involved. Cutting a few corners was routine; I borrowed a bit of material from the Revenant Hero Project, combined it with a promising mix of chemicals, and added a bit of sugar to make it taste better. Since this was all unautherized, I tested it on myself. Needless to say, I still have my tonsils. Now, however, they are super-powered!
Going into the character generator, I knew her name, but I don't think anything else. I built her powers and looks, and description, based on what looked fun at the time. She needed to look professional, yet like a lady who wouldn't mind occasionally being called, "Sugar".
Hmm, her description covers the basis of her sonic attacks well. For the storm powers, they, uh, come from the DNA of a Revenant Hero. Yeah, that's it!
Like most my villains, she would have eventually aligned herself as a rogue.