The Cheshire Cat (AKA. Cat Formerly Known as Cheshire, or Unitary Authority of Warrington Cat, or, to his mother, Archibald) was head librarian in the Great Library. He had an encyclopaedic knowledge of every single book in the library, knowing not just where it is, but also how many times it has been read ever and how many people are reading it at that moment. The bar of the Finis Hotel was named after him.