DnD Character Classes all have some observable sources and influences:
In the Oriental Adventures books there are a bunch of new classes, including Samurai and and Wu Jen.
But what are the inspirations for some of these classes? In particular, the Wu Jen has always made me wonder. Are they just (dare I say it...) based off Asian stereotypes an given funny nonsensical names or are they inspired by mythological and literary sources like their more Western counterparts?