Barsoom - A New John Carter

Mars, or better known to it's inhabitants as Barsoom, is a dying planet which survives on technologically created atmospheres and water.
The lifeforms that thrive on this planet, which has a lesser gravitational pull than that of Earth and a thinner atmosphere, have adapted to the living conditions here. But even so, the competition for survival in these lands is fierce, leading to the development of strange customs and a violent mindset among the inhabitants.
One day, a man named John Carter gets mysteriously transported to this planet which lies millions of kilometers away from Earth, and using the strength that the lesser gravity and the thinner atmosphere provides him with, he forges a legend in his journey.
At least that was how it should have been. Now, in place of John Carter, is another man, an amalgamation of both John and the one before him.
How would he, affect the world of Barsoom and the creatures it inhabits, the Barsoomians?
.
.
.
I do not own Barsoom series, it belongs to Edgar Rice Burroughs.
The fan fiction would follow the books as a source material and not the movies, though it may take some inspiration from it.