Spider Girl

Sussa Paka of 30th century Earth has the power to use her indestructible and malleable hair as weapon. Taking the name Spider Girl, she applied for Legion membership but was rejected on the grounds that her power was lame. She instead became a founding member of the Legion of Super-Villains. She would later become a hero and Legionnaire after the Dominators' takeover of the Earth, but that was at least a couple reboots ago. I think she's a bad guy again now.