I cant really think of anything that would make it unique as the only difference between both factions would be tech level, in which case everyone would try to beeline to the higher tech level unless your faction was more reliant on numbers while mine relied heavily on equipment but then thered be concerns of balance.
If anything I can throw you little tidbits and if you like any we can try expanding on them;
An exiled group of pirates were left in an irradiated part of the planet to die, however they did not. Instead their bodies became disfigured and leathery and they adapted to the environment.
A wandering band of doctors who come by to heal those that need help, no one messes with them and they can trade exotic medicine and maybe even train a pawn (questline?)
a group of prostophobes who are spacer level that believe in the purity of the human body and kill those who have prosthetics.
a tribesgroup heavily reliant on animals with everyone having a spirit animal assigned to them at birth, which would be the animal that they have tamed.
A sort of explorers guild that goes and looks for artifacts on rimworlds, maybe itll lead to information on who created the mechanoids or just like lore stuff that you youve incorporated into the mod.
Pallids, a group of cavers who cant be out in sunlight without proper protection.
The grimms, monster tamers who buy and sell exotic creatures like the thrumbo and any other legendary creatures you might add.
Nemors' children a cult that worships a water god and provide sacrifices in hopes of bringing him out of the water.
Just let me know which you find interesting and what you think could fit the lore of your mod. Also let me know what the different tech levels are and if religions are going to play a role as that could be an interesting mechanic.
If anything I can throw you little tidbits and if you like any we can try expanding on them;
An exiled group of pirates were left in an irradiated part of the planet to die, however they did not. Instead their bodies became disfigured and leathery and they adapted to the environment.
A wandering band of doctors who come by to heal those that need help, no one messes with them and they can trade exotic medicine and maybe even train a pawn (questline?)
a group of prostophobes who are spacer level that believe in the purity of the human body and kill those who have prosthetics.
a tribesgroup heavily reliant on animals with everyone having a spirit animal assigned to them at birth, which would be the animal that they have tamed.
A sort of explorers guild that goes and looks for artifacts on rimworlds, maybe itll lead to information on who created the mechanoids or just like lore stuff that you youve incorporated into the mod.
Pallids, a group of cavers who cant be out in sunlight without proper protection.
The grimms, monster tamers who buy and sell exotic creatures like the thrumbo and any other legendary creatures you might add.
Nemors' children a cult that worships a water god and provide sacrifices in hopes of bringing him out of the water.
Just let me know which you find interesting and what you think could fit the lore of your mod. Also let me know what the different tech levels are and if religions are going to play a role as that could be an interesting mechanic.