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".
Superwoman
Superwoman is the name of several fictional characters, who are supervillains appearing in stories published by DC Comics. All are evil or corrupted alternate-universe counterparts of Wonder Woman. Superwoman first appeared in "Justice League of America" #29 (August 1964) alongside the rest of the Crime Syndicate of America.