What daughter of William Godwin is most famous for the fictional monster she created? 
Frankenstein's Monster (Marvel Comics): Frankenstein's Monster is a fictional character appearing in American comic books published by Marvel Comics. Frankenstein's Monster (Marvel Comics):  The character is based on the character in the novel "Frankenstein" by Mary Shelley. Mary Shelley:  Her father was the political philosopher William Godwin, and her mother was the philosopher and feminist Mary Wollstonecraft.
Mary Shelley