Y’know what’s funny? The term “Mary Sue” comes from a character created by a female writer.
Wikipedia “Mary Sue” article said:
The term “Mary Sue” comes from the name of a character created by Paula Smith in 1973 for her parody story “A Trekkie’s Tale”[2]:15 published in her fanzine Menagerie #2.[3] The story starred Lieutenant Mary Sue (“the youngest Lieutenant in the fleet — only fifteen and a half years old”), and satirized unrealistic Star Trek fan fiction.