Lybia appears as a secondary character in the 1970 anime film. She is a dark-skinned Egyptian city girl serving as one of Cleopatra's handmaidens. Actively involved in the Egyptian resistance against Rome, Lybia accompanies Apollodoria to recruit Cleopatra for a mission to seduce and assassinate Julius Caesar, participating in Cleopatra's transformation at the temple in Thebes. She remains part of Cleopatra's inner circle, traveling with her to Rome. Lybia persistently insists Cleopatra must murder Caesar despite Cleopatra's romantic involvement. Her role consistently supports Cleopatra during political events in Egypt and Rome.

Lybia's background incorporates a science fiction element: she serves as the historical vessel for Maria Fellow, a human from the distant future whose mind is psychically projected into Lybia's body. This connection occurs when three time travelers from 2001 AD investigate an alien "Cleopatra Plan" threatening humanity. Maria's consciousness inhabits Lybia throughout the ancient Egyptian events, though this possession does not alter Lybia's established actions or relationships. Her involvement concludes with the historical account of Cleopatra's story, including Antony's defeat at Actium and Cleopatra's suicide. Lybia's specific fate remains undocumented.