Keroberos, often called Kero-chan, is the Guardian Beast of the Seal in the anime series Cardcaptor Sakura. He appears in the form of a small, plush toy-like creature with a lion's tail and wings, acting as a guide and protector for Sakura Kinomoto on her quest to capture the Clow Cards. Despite his cute appearance, Kero-chan is powerful, wise, and sometimes comically gluttonous, providing both comic relief and crucial support throughout Sakura’s adventures.