According to The Life and Times of Scrooge McDuck, Miss Quackfaster was originally hired by Scrooge's younger sisters Hortense and Matilda. At first Scrooge did not like the idea of having someone on his payroll, but he got used to her very quickly. In fact, some stories have revealed that Scrooge has come to depend on Miss Quackfaster. Even though Scrooge is a shrewd businessman and can easily smell profit, running basic organizational jobs in his own office is often beyond his capability.
Miss Quackfaster was created by Carl Barks, and first appeared in Uncle Scrooge #36 in the story The Midas Touch (the same story that introduced Magica De Spell), and her last name, "Quackfaster", was first used in Uncle Scrooge #39 in A Spicy Tale. In The Life and Times of Scrooge McDuck part 11 (1994) by Don Rosa she was referred to as Emily, while in Geoffrey Blum's story World Wide Witch (2001), she was called Florence. The name Emily was also used in an American localization. The character was also known as Miss Typefast in a number of stories (including Don Rosa's A Matter of Some Gravity).
On the show DuckTales, she was called Mrs. Featherby. She appeared in the episodes "Dinosaur Ducks", "Hero for Hire", "Blue Collar Scrooge" and "Yuppy Ducks", as well as 1990's DuckTales the Movie: Treasure of the Lost Lamp.
In the reboot series, Quackfaster works as Scrooge's archivist in the McDuck archives, located below the Money Bin.
Boom! Studios Comics
In Boom! Studios' Darkwing Duck and DuckTales comics she is shown to still be happily working as Scrooge's secretary and even helps to stop The Phantom Blot and other villains with the other characters when they all "found their inner Donald" and beat back the slime.
- As shown in the Uncle Scrooge comic The Spirit of Fear (first published in 2004), Miss Quackfaster is afraid of spiders.
- In the Italian Disney comic Miss Paperett e il malaugurato batticuore, one of the Beagle Boys falls in love with Quackfaster.
- In a series of Italian Disney comics, Miss Quackfaster, Grandma Duck, Daisy and Brigitta team up and go on adventures of their own.