Ouranos

Ouranos (in Greek, Ουρανός) is the Greek protogenos personifying the Sky. Ouranos is the Greek word for sky (a cognate of the English word air), Latinized form is Uranus. He is the husband of Gaia alone. He was the first ruler of the universe until overthrown and castrated by his son, Kronos. Ouranos could be the greatest villain in Greek mythology, even being worse than Kronos but maybe not as bad as Gaia since she is his wife.

History
Ouranos and Gaia were the gods of the sky and the Earth respectively. They became partners, and brought forth their children: the Cyclopes, the Hecatonchires and the Titans.

Ouranos didn't care for his children, in fact, he hated them. He hated his children that did not look normal most of all, such as the Hecatonchires and Cyclopes. They were unsightly in his opinion, and he wanted them gone. But he couldn't kill them, because they were immortal. So instead Ouranos threw the Hecatonchires and Cyclopes into Tartarus and positioned Kampê to guard them. This caused Gaia pain, and she was also furious because they were her children, and Ouranos cared nothing for them. She asked her children, the Titans, to get rid of Ouranos so she could save her other children, and only Kronos was brave enough to do it. He took a flint sickle Gaia made, and castrated his father. Nothing else was mentioned about Ouranus after that.

Other accounts stated that Ouranos pushed the Titans back into Gaia because the Oracle said that one of his children will overthrown him. When he grew up, Kronos cut Ouranos' genitals using the sickle and his genitals became Aphrodite and his ichor became monsters.

Kronos threw Ouranos' remains into the ocean. Aphrodite, the goddess of love and beauty, was born from the foam. It is also said that Ouranos' ichor became The Furies when it fell on the earth.

Personality
Ouranos was a horrible father, and didn't care for his children. He was a terrible husband too, because it didn't hurt him that Gaia was so sad about the loss of her children. Though it is possible that Ouranos loves her somewhat as stated in the "The Titan's Curse" by Atlas, "the sky still yearns to be with the Earth".

Powers
As Ouranos is the Protogenos of the Sky, he presumably is able to control the weather.

He presumably has superior power to most of the Olympians, seeing as he is an elder god and was able to throw many of his powerful children, (the elder Cyclopses for example) into Tartarus

The Titan's Curse
Ouranos doesn't appear in the books, but he is mentioned by the General, that a Titan must hold up the Sky because Ouranos is gone, and the Sky still longs to embrace the Earth. Atlas, a Titan, is assigned this torment as of the First Olympian War.

The Battle of the Labyrinth
He along with Gaia are mentioned by Annabeth.

Trivia

 * The 7th planet from the Sun, Uranus, is named after this deity.