The Zero World residents.
They were scattered around the universe, but there was naturally a huge part of them that lives on the special spaceship. It resembles The Earth as much as it can and people who couldn't adapt to the brutal world live here.
It's mostly for the generation that experienced Zero World's barrier being broken.
It's pretty impossible to thoroughly resemble their home world though. As the new generation were born, their bodies were already soaked in a magic and any other energies. A descendants were aware of brutal world from the very beginning and their desire to fight was totally opposite to their parents.
Those who had an unique bloodlines and divinities weren't blessed enough to be a normal 'human' beings though.
