I have a couple ideas too.
Humanity: The majority of the survivors. During the dark days they played with the cards they where dealt, and ended up surviving. They are the majority on Earth. the other races (although still human) have been empowered by them, so they may all survive.
The Awoken: During the fall of the Golden Age, some sought to preserve themself. They entered a state cryogenic freeze, fully expecting to be awakened once the clamity had past. But many millenia past before they where discovered, deep in the ruins of the old cities. When they were awoken they had no recolection of what they were. Just where they came from. They are relics of the old age. Time again they have tried to explain to us their tech, of the modifications made to our self. What these modifications used to do, we do not know and they have forgoten. The most obvious fact is it turns the skin blue. But now they provide a strong link to the traveler.
The Exo: In our dark days, some looked to science to persevere. They decided in order to fight their enemy, they would have to become something stronger. So they did. These humans reconstructed their dna at the base levels to produce more useful things out of food. When injected with a healthy portion of nanobots, they created the exo. Biological machines. The nanobots gather the carbon strands and weave them into a skin-like substance stronger than steel. The nanobots also reinforce and support the mussles and bones, giving the exo above avarage strength. These humans are forever encased in these bodies, only the most invasive surgery, or violent explosion could possibly separate them. As such they have become one with machine
these are my theories and i thank you for reading
English
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[quote]Humanity: The majority of the survivors. During the dark days they played with the cards they where dealt, and ended up surviving. They are the majority on Earth. the other races (although still human) have been empowered by them, so they may all survive. [/quote] Humans are the ultimate survivors, so this theory does make since. While it may not be as crazy and far-fetched as some other theories, it definitely is one of the more plausible ones. [quote]The Awoken: During the fall of the Golden Age, some sought to preserve themself. They entered a state cryogenic freeze, fully expecting to be awakened once the clamity had past. But many millenia past before they where discovered, deep in the ruins of the old cities. When they were awoken they had no recolection of what they were. Just where they came from. They are relics of the old age. Time again they have tried to explain to us their tech, of the modifications made to our self. What these modifications used to do, we do not know and they have forgoten. The most obvious fact is it turns the skin blue. But now they provide a strong link to the traveler. [/quote] Another interesting theory. This is the first theory I've seen where the Awoken existed prior to the arrival of the Traveler. I always pictured the Awoken as the least "Sci-Fi" of all the races, but with technology being a possible instigator for their different appearance and link to the Traveler, it provides another angle of approach towards the Awoken. [quote]The Exo: In our dark days, some looked to science to persevere. They decided in order to fight their enemy, they would have to become something stronger. So they did. These humans reconstructed their dna at the base levels to produce more useful things out of food. When injected with a healthy portion of nanobots, they created the exo. Biological machines. The nanobots gather the carbon strands and weave them into a skin-like substance stronger than steel. The nanobots also reinforce and support the mussles and bones, giving the exo above avarage strength. These humans are forever encased in these bodies, only the most invasive surgery, or violent explosion could possibly separate them. As such they have become one with machine[/quote] This is the most common Exo theory I've seen, but probably one of the most plausible. The general consensus seems to be that the Exo are simply Cyborgs (Cybernetic Organisms), and quite honestly that's probably what they are. My theory was a result of wanting something more in-depth and unlikely, as I find it more fun to come up with stuff like that.