Kerberos, commonly known as Kero-chan, is the Guardian Beast of the Seal in the anime and manga series Cardcaptor Sakura. He serves as Sakura Kinomoto's guide and protector as she captures and converts the Clow Cards. Kero-chan usually appears in a small, plush toy-like form, but his true form is a majestic, lion-like creature with wings. Cheerful, mischievous, and food-loving, Kero provides comic relief, wisdom, and unwavering loyalty to Sakura throughout her magical journey.