Percy Jackson and the Olympians: Legends

Nyx was described as a churning figure of ash and smoke, as tall as 40 feet. Her face was hard to see except for the pinpoints of her eyes, which shone like quasars. When her wings beat, waves of darkness rolled over the cliffs. Her dress was void black, mixed with the colors of a space nebula as if galaxies were being born in her bodice.

As the embodiment of Night, Nyx had a terrifying presence. Despite this, she is quite gullible, easily falling for the heroes' story. Though she is proud that most of her children are terrifying, Nyx is uncomfortable when someone asks her who is her favorite child. Nyx is emotionally and mentally abusive to her children.

Nyx was born directly from Chaos and Tartarus, two of the first protogenoi. She lives in Tartarus in the Mansion of Night, where she stays during the day and leaves during the night. In ancient times, Nyx, her daughter Hemera (whom she usually fights with), her son Aither, and the stars were the only constant company of Ouranos. Years later, Percy Jackson and Annabeth Chase would confront Nyx in the Underworld during their mission to stop Gaea's awakening.