Have you heard about Vladimir Propp's Morphology of the Folktale? He was a Russian professor of literature (?) who analyzed over 150 Russian folktales according to the functions performed in them. He identified 31 functions performed by 7 characters (hero, donor, villain, princess, etc.). The 31 functions may not all be in a given tale, but the ones that are in a folktale will always fall in the same order -- they cannot be shuffled. While he wrote the book in 1927, the U of Texas Press published an English translation in 1968, apparently still available. The ISBN is 0292783760, apparently going for around $16.00, but available on eBay for about $5. It is a fascinating, tiny little book, about 150 pages. I analyzed Gulliver's Travels in a grad course about 15 years ago and got an A on my paper. The most fun I ever had writing an assignment.