Esteban (エステバン,, Esuteban) (voiced by Shiraz Adam (English), Masako Nozawa (Japanese)) – An orphan who was rescued at sea as a young child by the Spanish navigator Mendoza.
He joins the Spaniards in their search for one of The Seven Cities of Gold in the New World, hoping to find his father.
Upon meeting a friend of his father in China, Esteban is revealed to be a descendant of the civilization of Atlantis, the ancient enemy of the Mu (Hiva) empire.
Zia (シア,, Shia) (voiced by Janice Chaikelson (English), Mami Koyama (Japanese)) – The daughter of an Incan high priest.
Initially he is evasive to the others' company when they wash up on his island, but when the ship Solaris was revealed he joined them on their journey.