Keroberos a.k.a. Kero

Sakura first met Kero when she opened the Book of Clow. He was the one who first told her about the Clow Cards, and that she must capture all of them again. Being the Magical Guardian Beast of the Clow Cards, Kero is very wise in the ways of magic, and guides Sakura through her quest. He knows things that she does not, and yet he doesn't tell her about them. Like Yue. Sakura dreams of him constantly, but Kero never tells her who he is. He believes in lettting her figure problems out on her own, instead of giving out he answers. By doing this, she becomes wiser and stronger.
Kero is a 'wise-cracking stuffed animal' according to Li. Kero is always joking around, and lightening everyone's moods. He is treated like a stuffed animal by Sakura, but this is only so that her father and brother do not suspect that he is really alive. Kero sleeps in one of Sakura's drawers every night, and has even fixed himself up a living room inside of the drawer. Madison has a special bond with Kero, and she always carries him around in her bag. She thinks he is 'soooo adorable'. Whenever Sakura dresses up to go capture a Clow Card, Kero gets dressed up, too. He usually dresses in something that has to do with Sakura's costume so they match.
Kero is small, yellow, and resembles a teddy bear. He has a very round head, a lion's tail, and wings. He is capable of fitting into Sakura's pocket (or bag), and often travelsin it. He's so KAWAII!
Here are some miscellaneous pics I cut out from larger pics. Click on the thumbnail to view a larger image.