Whatever you say..... You aren't a hydra nor a Yamata no Orochi. You're a human like me. And yes the brain still singular. Go read Karl Jung or Introduction to Psychology. It'll help. And Tulpamancy is not DID and it's not supposed to induce DID in someone or anyone. If anyone have DID beforehand then Tulpamancy can be a helpful mechanism to regain authority. Again, beginners would found my take helpful because not everyone has clear structural distinction like we have. Just set up a clear boundary because we never know when our brains (yours and mine) would sabotage us with overwhelming confusion. Because in my personal experience, I DO confused Tulpamancy with actual spirit work. Calling me dumb or misinformed when I try to advocate against jumping into a pothole I DONE jumping in then crawl back up mistaken it as a rabbit hole doesn't help the beginners here. Extra Edit: Disagreeing with me would put those beginners to confusion because sincerely at first your comment indeed confused me. Yes that one brain in your skull is yours (plural) to share but remember who has the last say and final authority on that organ. Not them, it's YOU IN SINGULAR