Phantasy Star III Character Book
The Phantasy Star III Character Book is a doujin work published by Toyo Ozaki, Phantasy Star III's Chief Character Designer, in January 1999. It contains sketches, art and manga drawn by Toyo Ozaki and her husband, Masaki Segawa.
A "Diet" version of the book was released a couple years later. It has the same content, except for missing the full-colour page at the beginning, and being printed on cheaper paper. This version can still be ordered through Toyo Ozaki's online ordering system.
In this section you'll find a gallery of the scanned pages, except for the manga. You can find the translated manga in the Comics section.
Thanks to orakio_rob for providing the scans.