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Massively has a great new article on the various classes. While it is more mechanics than lore based it gives a good run down, from one perspective, on the classes.
I think it is obvious he is writing from a tangman perspective, as some classes have different "worst classes to fight against" than others. My scholar fails against emei's rage destroying feint for instance as it means I never get to use my green shadow kick. However it is a great article for picking a school since it is such a huge choice in this game, and the only one you really can't take back.