One Piece Databooks, One Piece Wiki

The Databooks—commonly known as Fanbooks (ファンブック, Fanbukku?) or Character Books (キャラブック, Kyarabukku?) in Japan—are a series of encyclopedia-like books meant to supplement the One Piece manga, mostly by compiling facts and statistics on plot elements, characters, and the overall setting. Typically, they also contain a number of color spreads, compilations of various cover arcs, and behind-the-scenes material (including Eiichiro Oda's conceptual and preliminary sketches) as bonuses. So far, six da

One Piece Databooks, One Piece Wiki

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Here's how an actual one piece staff member discusses databooks

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