She is the wife of Zuras and mother of Azura (Thena). She lived with Zuras for a time and raised Thena, and retains maternal interest in Thena's welfare. Apparently she never felt comfortable in the society of her fellow Eternals, so she left their city of Olympia after Thena reached adulthood. after Zuras's death, she was content to let Thena become the new ruler of Earth's Eternals.

Cybele has always had a great interest in nature, and has been mistaken for Gaea. Today, she lives by herself in a forest in Colorado, using her psionic powers to remain unseen.