Some years ago, someone I knew ended up in a relationship with one of these people who several months into dating, dropped the bomb that they were a "multiple system," on top of a lot of other shit, like being a "relationship anarchist" and having a bunch of other partners or whatever. Started referring to himself as the royal we, all that shit. Dropped a PDF in the friend circle's group chat containing "helpful rules" on how to interact with him from that point on, and flipped his shit when no one agreed to play along.
This "system" was a troon, too, and had a bunch of kids, like four or five or something. Often spent the money given to him for the purpose of spending it on his kids and groceries, instead buying shit for his best friend who was also a multiple system, of course. Apparently he'd buy like 5 presents for this other "system," one for each alter, and then be short for real shit.
My friend was one of those types who has such an open mind he sometimes lets his brain fall out, but it all finally came to a head at last when this fucking weirdo unleashed a torrent of abuse at him for asking him to go to therapy, or asking what he was doing to deal with this condition.
This fuckstick went on and on about how mental illness was beautiful and how it was oppressive to ask him to get help. Then he tried to blame the verbal abuse on an alter and had a bunch of arguments with himself on Facebook.
I read through this entire thread just now looking for traces of these specific people. No mention of the main idiot I've mentioned, but this moocher best friend character was called Tara. I don't know if it's the same one as mentioned earlier in the thread because I never met Tara in person.
Still looking through backlogs to find the PDF that was dropped, but it was a long time ago now, and I'm pretty sure the main idiot has deleted Facebook. I recognise some of the URLs earlier as things he also linked, though.