Greebo

Greebo is a foul-tempered one-eyed tomcat whose owner, Nanny Ogg, insists against all the evidence that he is a sweet, harmless kitten. He has killed two vampires, eaten at least one of them.

From time to time Grebo is transformed into a human. In this form he appears as a tall young man with a beard, dressed in leather, and radiating sexuality. He is often confused by the differences between human and cat morphology and social relationships, but picks some aspects up quickly. He has attended the Ankh-Morpork Opera in the guise of the Count Gribeau.