Humans

Background	Left the Earth because it was no longer a place to live The air in the KCU is different from that on Earth, so humans need gas masks The Riders gave them the gas masks Later, some of them discovered that absorbing Kroma Energy allowed them to breathe without the need for gas masks.
Personality/characteristics	Nervous - Newcomers to the KCU Some of them were greedy and led to the end of the Earth