Keroberos, commonly known as Kero-chan, is a guardian beast in the anime series Cardcaptor Sakura. He is the protector of the Clow Cards and acts as Sakura Kinomoto’s guide and mentor throughout her journey. Despite his intimidating true form, Kero-chan usually appears as a small, plush, lion-like creature with wings. His playful, gluttonous, and sometimes mischievous personality brings comic relief, while his deep knowledge and loyalty make him essential to Sakura’s success as a Cardcaptor.