If you're woried about the character's outline then you don't really need 2d/pixel books, instead you need anatomy/drawing books, which are common at good book shops. I think there are, for example, how-to-draw-anime-books in about every language, some of those books also attend monster-drawing 'n such. Of course: Google also contains a rich source of websites related to drawing. And the odd eBook about manga you could spot on p2p might also be of help.
Pixel Art
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