Bookseller: a unique Wandering Trader who buys stories.

The Bookseller is similar to the Wandering Trader in that he randomly shows up and offers items. In this case the Bookseller sells items relating to writing: feathers, ink sacs, paper, and leather. However, what he's really looking for are Written Books with a type of story in them. Now here's where this idea gets tricky- the Bookseller will pay emeralds for a specific topic in mind, which would require a set of certain words, like three words displayed in his trade window, that are to be used in a short story written by the player. It would have to be a coherent story; not just the three words and a bunch of gibberish.

I suggest this because I think it would give a real use for the Book and Quill item, as well as a means to strengthen player's spelling and writing skills. Plus it can be fun for creativity. 

AND as an added bonus, any Written book you sell will automatically create a copy that you can keep for yourself! 

I'd imagine the Bookseller would wear a dark gray robe, similar to the Wandering Trader, but with ink stains on it, and some feathers stuck into his pockets.