Favorite flower: Sunflower
Favorite food: Sweet food
Favorite hobby: TV games
Favorite programs: Comedies
Residency: Currently in Sakura's room
Real appearance: A large lion-like animal with armor
Cerberus, nicknamed "Kero," is the appointed guardian of the book containing the Clow Cards. He is one of two magical creatures created by Clow Reed along with the Clow Cards. Before his death, Clow designated Kero to select a potential candidate to become the next master of the cards, as well as to oversee Cerberus himself and his "brother" and fellow guardian, Yue. After Sakura accidentally releases the cards, Cerberus chooses her as the candidate and teaches her the basics of capturing them. Throughout the series, he exhibits extensive knowledge of mysticism. Once Sakura passes the final judgment to become the Clow Cards master, Cerberus stays with her as a friend, companion, advisor, and protector whenever new threats arise.
Having spent considerable time in the book while it was in Osaka, Cerberus speaks with a distinctive Osakan accent. He tends to be bossy, demanding, egotistical, and a glutton, but clearly shows affection for Sakura, especially when she is hurt or in danger. He develops a fondness for video games and becomes addicted to sweets. Cerberus usually appears in a "false form," resembling a small, orange, winged stuffed animal. Unlike Yue, Cerberus derives his life energy from the sun and does not depend on the magical power of his master. However, his master must control the Firey and Light cards to activate his true form, a large-winged cat. In the anime adaptation, the Firey card is changed to the Earthy card to avoid delaying his transformation into his true form. Cerberus' name originates from the Greek mythological figure Cerberus, a three-headed beast assigned to guard the gates of Hades.
In the anime adaptation, his false form is voiced by Aya Hisakawa, while his hidden form is voiced by Masaya Onosaka. In the English release of the anime, his name is spelled Kerberos. In the English adaptation, Cardcaptors, it is changed to Keroberos. His false form is voiced by Matt Hill, and Richard Newman voices his true form. In the second film, he is voiced by Wendee Lee and Dave Wittenberg, respectively.
