Endo systems can be fully formed. Our core had to assign us base identities, and from there we developed into full fledged people. Our system has a vivid inner world. Our system can switch, and also has positive triggers. Our switches involve things feeling slow, misty, not real, a disconnect with the body, and being unable to move. However it feels less like someone is taking over, and more like youre trading the consciousness with someone else.
Heres my hypothesis on how our system works. Its largely based on tulpamancy: Instead of using disassociation from trauma to make headmates, you teach your subconscious to automatically send reactions and emotions for different “identities” while theyre in the innerworld. When a switch happens you take one identity, and swap it with another. While it may be swapping consciousness, each identity still has its own emotions, motives, reasoning etc etc
This is just how being plural is for us. I have a suspicion that most/if not all endo systems function like this, but i couldnt say. Endo systems, please let us know if were right
Edit 1: made it freaking readable
Edit 2: mentioned that this is my hypothesis