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".
George Kapitan
Also in 1940, in "Mystic Comics" #4 (dated Jul. 1940 in postal indicia, cover dated Aug. 1940), he and Sahle created comic books' first costumed, super-powered female character, the original Black Widow, Claire Voyant, an antiheroine who killed evildoers to deliver their souls to Satan, her master.