Nier Automata to Destiny
When the androids become the new version of humanity they begin to accept their role and exist from the likeness of original humanity including the desire to expand. Hoping to find a new Destiny amongst the stars and ancient records of Mars is discovered, they decide to preform and expedition to mars. A team of 3 travel to the red planet and ultimately discover a giant city shine sphere that communicates through their technological makeup with a message of it being a force of good and its desire to help. Eventually returning and soon followed by the giant, the traveler makes its presence further known amongst the rest of the of the androids. With the travelers influence, the new humanity is able to develop even more and reach new technological heights including advanced space travel for colonization and the ability to spawn biotic androids capable of growth from childhood to adult hood, as well as the creation of a new model of android optimized for extra terrestrial travel aka the Exos. Similarly in a more esoteric aspect the once freed gestalt souls are given form from the travel as the awoken where the air elevated into alternate state of existence outside of the bounds of normal space. But in a twisted game of fate almost as if any version of humanity is doomed to fail, a cataclysmic even arrives in the form of the darkness causing a collapse of the newly formed society and the "humanity" is forced into a new period dubbed the dark ages. After a certain period one particular guardian arises and must embark on a grand quest of finding one's place in the cosmos and defining the word "Destiny"
Etc.
the reason why the nine are so intrigued and willing to work with the guardians is because of what the new humanity represents i.e the ability to evolve and redefine itself throughout a course of destructive events and to rebuild despite a certain disdain to one's true origin
