This book is unconventional in that it is not intended as a listing of mythological creatures as such, but it is intended as a listing of creatures presumed by those engrossed in Harry Potter's magic world to actually exist. If there were a theme to be identified in the book it would have to be simply the validation that magic exists, and the underlying belief that wizards can encounter any of the creatures that grace these pages at any time.
In addition to the beasts themselves, the characters in the book are the Harry Potter characters who give these beasts reality. Included are Harry Potter, his friend Ron Weasley, Newt Scamander, Professor Dumbledore (who wrote the Foreword), and all of the peripheral characters who add validity to Rowling's world. Harry's friend Hagrid, for instance, also appears, as do Dumbledore's wife, Porpetina, and their pet Kneazles: Hoppy, Milly and Mauler.
Kneazles are just one of the seventy-five types of creatures listed in the bestiary. The entry for each type of creature attempts to validate the creature's existence by including a description of the its characteristics and habitat and an explanation of its relationship with wizards. Each entry also includes a Ministry of Magic (M.O.M.) classification rating how dangerous the creature is, whether it is essentially harmless, or whether it is a "known wizard killer" and "impossible to tame or domesticate." The horrendous Nandu who Harry and Ron encounter in Harry Potter and the Chamber of Secrets, the Knarl who Muggles often mistake for a hedgehog, and the demonic Nogtail who resembles a stunted piglet are just a few of the fantastic creatures listed in the bestiary. The footnotes provide additional information and refer the reader to other fictional...
(The entire section is 722 words.)