We don't know if they're Human, or at least part human, or alien. I've got my own theories, and I think each is some form a variation of humanity,
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Agree with above stated. Awoken is probably a evolved human that is more in tune with the Traveler than most. Exo's are probably cyborglike robotic shells for humans who are perhaps injured beoynd repair or on the brink of death due to disease or something of the sort and that this robotic body is now carrying their conciousness. Essentially they become a Exo, foregoing their mortal shells. That is what I think, and I'm writing my fan fiction based on that assumption that Exo's are cyborg shells where a gravely injured persons remains are kept alive and effectively the mind and personality of the person aswell.