Gender in speculative fiction
The first known female superhero is writer-artist Fletcher Hanks's minor character Fantomah, an ageless, ancient Egyptian woman in the modern day who could transform into a skull-faced creature with superpowers to fight evil; she debuted in 1940 in Fiction Houses "Jungle Comics".
Super Women
According to the entry in the International Catalogue of Heroes, Super Women's real name is Kristine, and her powers include incredible intellect and hypnotic powers, gained after willingly submitting herself to an experiment.