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Ivan is a 15-year-old boy who joins Isaac's quest early on in Golden Sun and remains a part of his party for the entire series. Ivan, as a Jupiter Adept, can use Psynergy to conjure forces of wind and electricity, and he possesses two inherent Psynergy-based talents: The ability to perceive hidden truths about environments and the ability to read the minds of people and animals alike. He joins Isaac on his quest after Isaac helps him out early on, unaware at first that he is the main subject of a prophecy that predicts Ivan would join Isaac in the latter's endeavors. While Ivan functions alongside Garet and Mia as the "voices" of Isaac during in-game cutscenes in the first game (where Isaac is depicted as a silent protagonist), he does not have much bearing on the core plot itself. He is central to a subplot that spans both games and deals with his personal history and his true hometown, which is visited in The Lost Age. In the game's final scene, Ivan is seen laughing with Garet and Mia, their journey finally over.
(Source : Wikipedia's article)