Kero-chan is the small, cheerful guardian beast from Cardcaptor Sakura, originally known as Kerberos. He serves as one of the guardians of the Clow Cards and becomes Sakura Kinomoto’s mentor and companion after the cards are released. Though he often acts lazy, greedy, and playful, Kero-chan is knowledgeable about magic and helps guide Sakura in collecting and sealing the cards. His role is both comic relief and a vital source of magical support throughout the series.