Joanna is a recurring character, who first appears in "Petergeist" and then later on in "Movin' Out (Brian's Song)". She works in a library and is invited to a surprise party Stewie organized for Brian. She is known to have a very annoying way of laughing and usually laughs at her own jokes. However, she gets along well with Stewie, who took an instant liking to her upon their first encounter.
In "Short Cuts", she shops at Goldman's Pharmacy. Her employment is also confirmed to be the Quahog Public Library. She is seen again as the librarian that mistakenly gives Peter Van Halen's CD of 1984 instead of George Orwell's book of the same name in "Coma Guy".
In "Wild Wild West", she is renamed as Elle Hitler when she volunteers to run for Mayor with Lois' support. Peter, wanting a man for the job decides to ask the late Mayor Adam West's cousin, Wild West, to run instead. Although Lois is unhappy with Peter's actions at first, West manages to win her over. Peter decides to switch sides and support Elle. Finding her to be a complete basket case, he tries to sabotage West, but sets the library on fire with her inside. She is saved by West who later wins the election.
Joanna/Elle is voiced by Alex Borstein.