In any case, I'm pretty sure this plurality shit isn't a thing. It's definitely not DID though.
I've said this before, but any time you see someone online talking about being a system or having DID they're LARPing. No exceptions. All of them are faking it because they think it makes them more interesting and special. It works well with autism, being a troon, and other mental issues, so they can commit to the bit, but not a single one has DID or any other form of split personality disorder in whatever form you think it takes.
This becomes super-extra-clear with the ones who act like characters from fiction are living in their head. The one thing that any form of DID relies on is being a coping strategy for trauma, and that doesn't include some moody cunt obsessed with a computer game pretending the characters are now in their head and actual parts of their personality.
The condition itself might be fictional, it might not. But if they're on Tumblr, Twitter or any social media with it, then they are 100% lying. Plurals, like otherkin and transracials, are the step beyond troonery - and a logical endpoint of a lot of their nonsense. It's why, if they're not one themselves, troons
hate them and get massively offended if you bring them up, because even people who think of troons as Gay Plus and try to be accepting balk at the idea of being trans-species or trans-racial. But there's no logical argument for accepting people playacting the opposite sex while rejecting people playacting any other difference, including that they have cartoon characters living in their head.
So of course it should be brought up, and brought up often.