The faune first appears in the novel's second section, "Benjy." Benjy is the Compsons' mentally disabled son, and he is drawn to the faune because it represents the freedom and lack of inhibition that he lacks. Benjy is also fascinated by the faune's sexual nature, and he often follows it around the woods, trying to catch it.
The faune also appears in the novel's third section, "Quentin." Quentin is Benjy's older brother, and he is also haunted by the Compsons' history of incest. Quentin sees the faune as a symbol of the wild, destructive side of human nature, and he believes that it is responsible for the Compsons' downfall.
In the novel's fourth section, "Jason," the faune is no longer present. Jason is the Compsons' youngest son, and he is the most practical and materialistic of the three brothers. Jason does not believe in the supernatural, and he sees the faune as nothing more than a figment of Benjy and Quentin's imaginations.
The faune is a complex and contradictory symbol in Faulkner's novel. It represents both the wild, untamed aspects of nature and the destructive, incestuous side of human nature. The faune's presence in the novel suggests that the Compsons are unable to escape their tragic fate because they are trapped by their own dark desires.