Alexis Luthor

Alexis Luthor was a character from the Legion of Superheroes and originally a friend of Superman, though she was always spoiled and selfish - she would only turn antagonistic after Superman began to try and break ties with her in order to help the Legion deal with supervillains, unwilling to stand by and let Superman be a hero Alexis decided to "get rid of the competition" by attacking the Legion with the aid of her hi-technology and even attempted to kill Superman after he rejected her once again.

Yet in the explosion caused by her failed attempts to damage Superman her hair fell off (a subtle reference to the Golden Age origin of Lex Luthor's baldness) and she blamed Superman for her humiliation - as well as her subsequent imprisonment for her crimes.

When last Alexis was seen she was still in prison and clearly still holding a grudge against Superman, despite him having done everything he could to reason with her.