Kabu

Sally's magical, shape-changing assistant. His first appearance was a crow before Sally's Dad sent him to Earth to retrieve her. Assuming the form of a five-year-old boy, Cub poses as Sally's younger brother. Cub is mischievous, usually playing pranks on Sally and friends or triggering unpredictable situations. However, his level of mischief has been on par with the Hanamura Triplets and Poron.

(Source: Wikipedia)