The point of this post is to try to speculate which mortal races may have descended from certain demon worlds and why.
Third Demon World: This is the largest and seemingly most populated demon world with a diverse set of races. Demons come in all shapes and sizes in this world. It is also a harsh and unfriendly environment that is frequently mistreated by the elites of the first demon world. As a result, it would make sense that a lot of demons from this world would have fled at some point into the mortal universes in hopes of a better life.
Races that may have spawned from the third demon world:
Second Demon World: Not as large and populated as the third demon world, but still seems to have a sizeable population. We know that the Namekians and Glinds come from this world. Based on what we have seen and heard about this world the demons that hail from here seem to be powerful magically inclined beings. The demons in this world have had a history of being attacked and constantly persecuted as seen with why the Glinds had to leave and why Neva created the barriers. It makes sense why many of them would also leave.
Races that may have spawned from the second world:
First Demon World: This is the smallest demon world with the smallest population. There does not seem to be much diversity in terms of the demon races in this world. With how guarded and wealthy the first demon world seems to be, it is likely that no demons have had any reason to migrate to the mortal realms. The servant demons seem to be from other demon worlds like Dr. Arinsu and Degesu being Glinds and while it is never shown where the Gendarmerie hail from, it is possible that they were outsourced from the third demon world to serve the elite class in the first demon world.
To conclude, the various demons that have fled the Demon Realm to the mortal universes have greatly impacted the progression of the development of said universes in all kinds of ways. What do you think?


