The themes usually revolve around the librarian's role in the Naruto world. This includes their contribution to the growth of the characters, especially the young ninja. They can act as mentors through the knowledge they possess. Also, there is the theme of discovery. The librarian may lead the characters to discover new places, jutsu, or even forgotten aspects of the ninja history. Additionally, the idea of protecting knowledge from falling into the wrong hands is also a common theme, as the librarian has to safeguard the precious information in the library.
Well, there's a fanfiction called 'Naruto and the Mysterious Librarian'. In this story, the librarian is a new character who comes to the village and holds the key to a powerful ninja artifact. It's full of mystery and adventure. Also, 'The Librarian's Influence in Naruto' shows how the librarian's knowledge affects the characters and the overall story development in a very unique way.
A common theme is adventure. Since he is a librarian in a magical world, there are often quests for rare books or artifacts. Another theme is mystery, like trying to solve the secrets behind old library sections.
Another theme is the protection of the library and its contents. Librarians in these fanfictions are often portrayed as guardians of not only the physical books but also the magical knowledge within them. They have to fend off thieves or those who would misuse the knowledge, like in some stories where dark wizards try to steal powerful spell books from the library.
The characters included the male protagonist, Igor, an unknown age, powerful magic, and ancient wizard bloodline.
"The Hogwarts librarian" Author: Little Zombie Who Can't Jump. It's a light novel/derivative doujinshi novel with daily life, relaxed, and cautious elements.
An ancient family, a mysterious spell, a turbulent era…
P.S. Fantastic Beasts timeline.
I hope you will like this book.
I'm not sure specifically as there could be many novels with 'the librarian' in the title. It might be about a librarian's daily life, adventures in a library, or perhaps a mystery involving a librarian.