Zia is the daughter of an Inca priest Papa Kamayo . She was taken away from he father by Governor Pizzaro because she has the ability to translate the Quipu which is a form of communication by the Incas using strings and knots in them.    Zia has the Medallion of the Sun (like Esteban) which  is a key to the Cities of Gold. It was handed down from generation to genaration of her family. She is a kind and caring person but tends to judge all Spaniards the same. Unlike Esteban who trusts Mendoza, Zia think he is just after one thing, Gold.    Zia is a brave person since she has risked her life on many occasions such as when she gave herself up to the Spaniard to save the Mayan Village, but she believes that friendship is the most important than the Cities of Gold when she allows the Olmecs to enter the City of Gold to save Tao's life.

1532. Esteban (12) is a foundling from Barcelona, with a mysterious power of ordering the Sun to appear, for which he is called "Child of the Sun". Upon the death of his adoptive father, Esteban learns he was rescued as a baby from a sinking ship in the ocean. The mysterious medallion that Esteban wears since ever has a trace somewhere in the New World, probably coming from the Mysterious Cities of Gold. Esteban leaves Spain to find his parents and find out who he is. On the way he meets Zia, an Inca girl who was kidnapped from her people years back and has exactly the same medallion as him. Later on they are joined by Tao, a young Galapagos robinson, the last descendant of the Empire of Heva, an Empire said to have built the Cities of Gold. Following Coyolite, the shining star represented on their medallions, the three children travel through the unexplored New World, searching for the Cities of Gold, believing that this way is leading them to their lost parents.
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(Source: Anime News Network)

Sister of [Sandro Acerbo](https://anilist.co/staff/96096)