Greebo
Nanny Ogg's cat. A huge, one-eyed tom who divides his time between sleeping, eating and fathering the most incestuous feline tribe. He is technically a mottled grey but is covered with so much scar tissue that he looks like a fist with fur on it. He can only be said to have ears because there's no other word for the things left on top of his head. Greebo's good eye, his left one, is yellow. The other one is pearly-white. He radiates genuine intelligence. He also radiates a smell that could knock over a wall and cause sinus trouble in a dead fox. Although he is addressed by virtually everyone as "Yarrgeroffoutofityahbastard", to Nanny Ogg he is still a cute little kitten and still sleeps on her bed when not out at night looking for something to fight, rape, eat (or all three). The way he affectionately tries to claw her eyeballs out in the morning is as good as an alarm clock.
However, a residual effect of a hasty spell on the part of his owner has now left Greebo with the ability, not always controllable, to turn into a human form. As a human, he is 6 feet tall, broad shouldered and leather clad, with rippling muscles under his shirt. He has long sideburns, a mane of black hair, a broken nose and a black patch over his bad eye. And, it should be added, a worried expression for much of the time. A lot of the things which, as a cat, he would do quite naturally present him with all kinds of problems when he attempts them in human form. Greebo tends to flip into his alternative shape when he finds a situation he can't deal with in the current one. On top of all his other problems, this means that people occasionally find a naked human running around meowing.