This is an interesting article about librarians and stereotyping, in which the stereotype of librarians being ‘cold’ rather than ‘warm’ puts them at a disadvantage in their post 1970s role as teachers. Because the librarian workforce is overwhelmingly female, the expectation of warmth — and as carers/nurturers is higher.
The Magic Librarian at TV Tropes
The Scary Librarian at TV Tropes
The Hot Librarian at TV Tropes