Jasper Fforde! For Kids! The Last Dragonslayer is listed on the Cybils (and at the library) as YA but it seemed a little young to me. Not that older teens won’t like it, I think some would – but I can think of a lot more 10 year olds who would really get into it than I can 17 year olds.
Jennifer Strange is a great character. Tiger Prawns is also excellent. I loved the Quarkbeast (and it looks like the next book is Quarkbeast related, so yay!). I’d like to get to know more of the magician people in future books.