HOTW - the Phantom Lady

From WIki- Sandra Knight assumed the identity of Phantom Lady in a costume consisting of a green cape and the equivalent of a one-piece yellow swimsuit. She used a "black light projector", a device which allowed her to blind her enemies and make herself invisible. She drove a car whose headlights also projected black light when necessary. She was sometimes assisted by her fiance, Donald Borden, an agent of the U.S. State Department.

I never saw much of the Quality heroes until they showed up in the JLA/JSA crossover Crisis on Earth X.  So those were all new heroes to me.  She was athletic and used her black light ray projector to fight crime, mostly spies.  She never made much more of an impression on me, despite the skimpy costume.  Since that time from the 70s, DC has done a lot with the character, and of course, had several more people assume the name.