Aither (also spelled as Aether) is the primordial god of Light and the Upper Air. He is the male counterpart of his sister and consort Hemera, with whom she had one child: Thalassa, a Protogenos of the Sea. Aither is a son of Nyx and Erebos.
Aither (Light) was born from Nyx (Night) and Erebos (Mist and Darkness). With each morning, his shining light of heaven bathed the earth when his sister Hemera (Day) dispersed the night's mists.
Aither eventually marries Hemera, whom he has a daughter, Thalassa. On ancient times, Aither, his mother Nyx, his wife Hemera, and the stars were the constant company of his uncle Ouranos.
Aither presumably has a god's powers, but is extremely powerful, as he is one of the Protogenoi.
Caelumkiinesis: Being the physical embodiment of the Upper Air, Aither has absolute control over air and sky. His abilities include:
Aerokinesis: As the protogenos of Upper Air, he can control and create air and wind without limits.
Nephelokinesis: As primordial of the Upper Air, he can control and create clouds.
Atmokinesis: As the primordial of the Upper Air, he can control the weather conditions (or simple sky).
Photokinesis: As the embodiment of light, Aither has absolute control over light.
Ironically, Aither and Hemera are the elders children of Erebos and Nyx, the Darkness and the Night, while he and his sister are the Light and Day.
Curiously, he and his sister Hemera are the only children of Nyx and Erebus who are Protogenos even with the others being feelings or things, like Thanatos are the Death, Hypnos is the Sleep, etc.
With his parents, his uncle Ouranos and his aunt Gaea, the latter and his uncle Tartarus, and he and his sister-wife Hemera, they are the only known Protogenoi who "generate" another Protogenoi through sex.