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Greebo is Nanny Ogg's tomcat, he is feared in the forests of Lancre by all animals, and he is the father of most of the cat population in the area. Flea bitten, with scars all over his face and his partially present ears he is a huge swaggering bully of a cat - renowned for once chasing a bear up a tree. He has one green eye and one which is milky white, he is intelligent for a cat but uses three catagories to define the things he sees 'rape,fight or eat'. This is the cat that Nanny Ogg refers to as 'Mr. Puss-puss' and sees in her head as a cute little bundle of fluff - yet everyone else calls 'gerroffyerbugger!!'

In Witches Abroad he was magically transformed into a human, and appears as a swashbuckling, dastardly buccaneer with an eye patch who emanates enough sexual energy to power a television. He can speak individual words with a drawn out accent, and he was also pleased to find that his cat's agility had transferred over to his human form - as well as a set of retractable, razor sharp claws on each hand.

Following the conclusion of Witches Abroad, Greebo still changes into human form when under stress etc, usually Nanny Ogg would hear a scream, then the naked Greebo would run into the room and ask for milk and fish heads.

Before becoming human, Greebo once swallowed a vampire in the form of a bat. Vampires are resilient. They may have managed to rise (repeatedly) from the grave, to survive being sealed in a glass bottle in vapour form and then thrown into the sea, to be powdered to dust and restored by the merest drop of b-vord... but if this vampire manages to rise from the cat, the normal action of biology and digestion means this only is the start of its troubles...

Only four things have ever got the better of Greebo. A vixen defending her cubs once forced him into retreat and taught him a lesson about mixing it with mothers. At some point he has had an encounter with pictsies that has left him wary of further involvement. Erzulie Gogol's familiar, the black cockerel Legba, induced a feeling not unakin to that which he had when trapped in the Lancre Windmill, of being in a room full of oddly shaped furniture that, if he placed a paw wrongly, could crush him completely.

Most recently, the pure white kitten You, gifted to Granny Weatherwax by Tiffany Aching, has in the words of Nanny Ogg "fixed his head" to make any future acts of aggression impossible. She did this by means of a hissing scream and a pawful of claws applied to Greebo's sensitive nose, followed by a confident air of "Would you like some more of that?", and a nonchalant assumption of Greebo's food bowl being hers by right of conquest.

There may be another way of reading this. As in The Unadulterated Cat we are assured that an essential part of any cat courtship is the affronted female turning, hissing, spitting and giving the hopeful male a face full of claws, are Greebo and You, in their infrequent meetings, establishing the pattern for later grown-up...er... associations? (A female cat becomes fully sexually mature at between eighteen months and two years, but even then will make it very clear that she does the choosing, OK?) It appears that neither Granny nor Nanny has yet considered this possibility, but Greebo, in his lifelong quest to be the only set of male feline genes in town, quite possibly has a little part of his brain hardwired to checking out future possibilities. Any kittens born of these two parents, further down the line, should have a most interesting pedigree, particularly if by the rather elastic laws of Discworld genetics they inherit Daddy's ability to Turn Human in a tight corner.

[edit] Reverse Annotation

In Robert J Sawyer's science-fiction trilogy The Quintaglio Ascension (pub. New English Library, 1993), which is about a world where dinosaurs developed sentience and the dominant lifeform is an intelligent version of Tyrannosaurus Rex (but which has a problem with periodic regression into berserk teritorial fights and feeding frenzies) one of the biggest, toughest, hardest Tyrannosaurs in the pack is called Greeblo. A Pratchett fan?