Fu-Fu or by his full name, Di Di Fu-Fu is a young bat and best friend of Sagwa Miao. He has spectacles and is a clumsy 8-year-old flier and often forgets his instincts as a bat. As Sagwa's friend, he constantly has to advise her and tries to keep her out of trouble.
Fu-Fu first met Sagwa, when she got herself stuck in pot of ashes when she was younger and didn't got her markings and the reason for one side of his glasses being bent and broken is that he crashed into a pagota.(This was revealed in the episode, 'Sagwa's Lucky Bat')Personality wise, Fu-fu can sometimes get easily scared and startled at scary things, like Tai-Tai's dogs Ping, Pong and Pang and even Sagwa's actions. He also does silly things on accident, such as giving the Cat Burglar the jewel from the statue of the Foolish Magistrate's great-great-great-great grandfather, but he always try to make things right in the end.