Fu-Fu is Sagwa Miao's best friend.
He is a clumsy 8-year-old flier. As Sagwa's friend, he constantly has to advise her and tries to keep her out of trouble.
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.
Fu-Fu often forgets his instincts as a bat.
Fu-Fu is a young bat who wears spectacles, the left side being bent and broken.
- Fu-Fu first met Sagwa when she got herself stuck in pot of ashes when she was younger and did not got her markings.
- The reason for one side of his glasses being bent and broken is that he crashed into a pagota. This was revealed in "Sagwa's Lucky Bat."
- His full name is Di Di Fu-Fu.