The cute lion cub in our fanart Cardcaptor Sakura Cerberus Sticker is a protagonist character in CLAMP's manga and anime series Cardcaptor Sakura. His name is more commonly known in its Greek version, Kerberos, which is also often shortened to Kero-chan or Kero. Cerberus is one of the two Guardians of the Clow Cards created by Clow Reed. Before his death, Clow chose Kero as the selected potential candidate to be the next master of the cards.