Enid Blyton, her daughters and her trusty typewriter
I didn't read all 21 books in the Famous Five series, but as a grade schooler, I was a huge fan. Julian, Dick, Georgina (who insisted on being called 'George'), Anne and Timmy (George's dog) solved mysteries, thwarted danger and managed to have rich, independent lives without much adult interference.
The writer Enid Blyton published hundreds of books spanning several decades. According to The Enid Blyton Society webpage, "at the height of her powers she produced 10,000 publishable words per day." Astonishing, considering that she typed her manuscripts using just her two forefingers, with her typewriter perched on her lap.