She was good enough, I guess. I think all of the villains in H20 weren't very good.

Charlotte was a good villain

Was Sophie even a villain? She was a whiny, petulant, painful character, was poorly written, and barely had a personality outside of being awful to Bella, aggressively pursuing Zane, and controlling Will. She was materialistic, which is why she suddenly wanted to steal the crystals from the merpool, but she was a terribly conceived character, as I never understood her motives.

Absolutely not, worst character ever