Feng Bo1 is a title meaning "Wind Bo" - where "Bo" is a rank of nobility. His name is Fei Lian (飞廉 fēi lián), and he was once one of Chi You's (蚩尤 chī yóu) blood brothers.
Feng Bo is described as having a deer-like body, covered with leopard-like patterns, the head of a peacock, grotesque horns, and a snake-like tail2.
1 also known as "Wind Master" (风师 fēng shī) and Ji Bo (箕伯 jī bó)
2 another description of Feng Bo describes him as having the body of a bird and the head of a deer
During the time of the Yellow Emperor (黄帝 huáng dì), Fei Lian was Chi You's apprentice and right-hand man. They both studied under the same True Daoist Master (真道人 hēn dào rén) on Qi Mountain (祁山 qí shān) where they cultivated themselves for many years.
One day whilst cultivating himself on Qi Mountain, Fei Lian noticed a rock on a mountain in the distance that would fly in the air, much like a swallow, every time the wind picked up and rain fell. Then, when the wind and rain subsided, the rock would float back down to it's original resting place where it lay until the cycle repeated itself again. He grew curious and kept a close eye on the rock from that point onwards.
One night, the rock broke it's pattern. In the blink of an eye, and without warning, it suddenly started to move along the ground, despite having no legs, but now it seemed more like a large cloth bag than a rock.