Humans, humanoids, and anthros that lived were basically the last folk that is keeping the place together like glue, but they couldn't always last long due to their exaggerating low birthrate and murders among others.
The humans there are also known as the 'First Mechanics', while everyone else is regular ones. Even though they are able to become androids for better living chances, there are still some who just wants to stay what they are. They offer to their fellow humans as a gift or as torture.
Androids' acts like humans as well, able to eat sleep- all the human essentials. But the only thing opposite is that they are able to live a but longer up to 275 years. (Rare luck if 300)
They unfortunately take it for granted and is the small reason why they have the human's population low. Trying to persuade that becoming one is great. Androids also create small gangs with others.
Androids, it not over the full body. If technology takes over 65-75% of body then its considers a Robot; this excludes Nitro.
Robots, this is if you want to normally want to lose the feel of humanity or afraid of the whispering death. Their whole body is replaced with technology and other essentials. It's also rather expensive; financially and figuratively. All your memories are transferred into a chip, that's where there is high risk into being memory wiped and manipulated. Robots are common for being sentinels/the authority.