Nyx

Nyx is the Greek primordial goddess of the night and hellhounds. She carries the mantle of night in her chariot pulled by two dark horses Shade and Shadow, covering the world with darkness. Nyx is one of the first beings to have sprung from the void of Chaos.

Early life
Nyx was born directly from Chaos and Tartarus, two of the first Primordials. She lives in Tartarus in the House of Nyx, where she stays during the day and leaves during the night.

Nyx married her older brother Erebus (Darkness and Mist) and had many children with him. She also had children on her own, such as her daughter Hemera (Day), who left Tartarus when Nyx entered it, creating night and day.

On ancient times, Nyx, her daughter Hemera (whom she usually fights with), her son Aether, and the stars were the only constant company of Uranus.

Trials of Heracles
Under Hera's orders, Nyx's son Hypnos put Zeus to sleep so the Olympian goddess could shower Heracles with misfortune without Zeus interfering. Zeus soon found out about Hypnos' involvement and furiously chased him. Hypnos quickly fled to his mother, who Zeus respected enough to hold his anger at bay.