Nyx
Goddess of the Night.
Nyx was a goddess with black wings who lived in the Underworld and only came out at night. She was the daughter of the god Chaos. She also had a brother, Erebus. Nyx and Erebus had two children, Aether (Atmosphere) and Hemera (Day). In some legends, Nyx had more children on her own. Those children all lived in the Underworld.