Human

Humans are a mammalian humanoid species native to several systems through the galaxy.
Humans are the most widespread species in the galaxy, encompassing over 70% of all known sentient inhabitants. They represent the majoritarian species in planets like Moya and Almoir. Regarding those two planets, they are often considered as native inhabitants of both, although there haven't been concluding evidence of humans evolving from from either of them in an exclusive way.
Humans are also considered natives to planets such as Khannh, where they represent more than 80% of the sentient population.

Theories

Humans have long inhabited the vast majority of ecosystems, planets, and worlds of the galaxy, and are considered native to several of them despite not having a clear, obvious, unique origin. It is because of all this, summed to their demographic, diplomatic, and political dominance over the galaxy, that the species has long been assumed to be the optimal evolutionary step in nature, with the most prominent theory being that of convergent multi-lateral simultaneous evolution in multiple far-apart worlds.

The Great Sins

Humans are also considered to be "The Great Sins", as they have always been characterized of being selfish, immature and of poor culture, in the vast majority of cases. They have been the cause for many catastrophes of the galaxy, including the destruction of whole species and populations for the sake of colonization, or that of annihilation of whole planets for the sake of war. For these, they have gained a miserable reputation among other species, but have lately made a cultural comback because of their association to the rebellion movements across the galaxy.
Despite all this, Humans remain as the only species to have extinguished other sapient species, having done so in at least three separate occasions.