Saturos is a Mars Adept who along with his partner Menardiis the main antagonist of Golden Sun. The pair leads the original effort to break the seal on Alchemy and bring it back to the world of Weyard, and is opposed by Isaac's party all throughout the first half of the game.
Saturos hails from the northernmost settlement on the world map, Prox. He, like the people of Prox, is of a distinctive race that is very human-like but characterized by almost reptilian scales and spikes on various areas of their flesh - but more importantly, their natural proficiency to the Marselement. They are thus afforded both a natural toughness and a natural immunity to the constant cold of their environment. Among Prox's warriors, Saturos has become recognized as the village's strongest, even amongst his contemporaries Agatio, Menardi, and Karst.
And he is voiced by Brian Beacock in the English dub and he will be voiced by Takehito Koyasu in the Japanese dub.