An Ultra Beast that hails from a universe almost unknown to even it's own kind. Way back when, Kosis lived and survived in a land of pure authoritarianism by the hands of other Ultra Beasts. A regime centered around assimiliating beings, that have different moral standings, to comply with the societal standards of Pokemon kind. This civilization would gladly give up the wellfare of their inhabitants if it meant more allies with outside worlds. With this strict dictatorship few are allowed in and few are allowed out. Because, behind it's pristine outer appearances stands an unjust infrastructure built on harming the citizens of it's land.

This mistreatment of the Ultra Beasts that live on the planet would be the background that would mold Kosis' story. They lived in a world where it's own Nihilego brethren were seen as pests. Animals that deserved no respect from the system, all due to their feeding behaviors, which they had no control of. Many Nihilego had perished from the starvation tatics implemented by their laws. Kosis was one of the few to survive this. This physically gave it the traits able to withstand year long starvation. Kosis could live their entire life without relying on prey to consume.

Or that's what they thought. Currently, they refuse to eat a single meal. They fully believe that no living creature should be eaten just for the natural body's needs. Ever since they escaped into Vast, they have vowed to never prey on a Pokemon. Despite their moral belief system, day by day their natural instincts are increasing evermore. Currently, they are depriving themself of the food they require which is decreasing their health slowly.