Worst: Harley Quinn
Though Harley Quinn isn’t necessarily a hero she isn’t always a villain either. She doesn’t have any powers but she was injected with a special toxin antidote by Poison Ivy that makes her immune to certain chemicals and gives her the skills of enhanced strength and durability. She’s kind of a loose cannon and while there is a standalone Harley movie coming out next year, we’re not sure if she’s even that great yet.