basaur asked:

If it isn't too much to ask, I've been curious about this since we first arived at your library, who do/did the other library cards belong to? One was Devonshire but what about the other four?

Long-departed trusted confidants of the former librarian, or perhaps the castle’s contemporary keeper. As such I would prefer not to divulge their identities, though I doubt many alive today would recognize the names.