Cronos, the god of harvest, the youngest of the twelve titans, and the leader. Cronos was born from mother earth, Gaea, and Father sky, Uranus, as were the twelve other titans. Seeing as Cronos had overthrown his father before him he would eat his children to protect himself from the chance of being overthrown aswell.
Rhea controlled Cronos' kingdom. Not only was Rhea another daughter of Gaea, but she also was the wife of Cronos. Following in the footsteps of her mother, she planned with her children the overthrow of Cronus and the new age.
Prometheus was the son of Lapetus and the Oceanid Clyemen. Prometheus sided with Zeus during the Titanomachy, however after the war, he quarreled with Zeus over the treatment of the humans. He stole their fire and gifted it to the humans. This resulted in Zues chaining him and sending an eagle to eat his liver everyday.
Epimetheus was the brother of Atlas, Prometheus, and Menoetus.
Atlas was the son of Lapetus and the Oceanid Asia. He was the leader of the Titans in their rebellion against Zeus and thus got the punishment of holding the universe on his shoulders.
Helios was the god of the sun. He was the son of Hyperion and Theia. He was the brother of Eos, the god of dawn, and Selene, the god of the moon. He is conflated with Apollo and was also known as Sol.