Kero-chan is like a small stuffed animal that talks and flies. He is also the Guardian of the Clow Book in which he slept in job for around 10 thousand years.

He also helped Sakura in capturing the Clow Cards as it was also his fault they got loose. He was stuck in his temporary form until Sakura caught the very last card, the Earthly. His powers are based from the sun. And can also control the power of Fire and Earth.