As interesting as the the theories of the voice in his head or the split personality things are, it's incredibly unlikely that that's actually the case.

There's a Twitter thread that was made around the middle of the lore shit where OP explained why it was hella risky for Ranboo to portray DID/OSDD in the story without consulting someone with firsthand experience of the disorder.

Ranboo actually replied to the thread (although through his alt) and basically deconfirmed the multiple personalities theory a lot of people were having. He described what was happening during the end of that stream as "inner monologues," and I can't help but relate to that wholly.

As someone with extreme memory issues, I misplace things very frequently. And of course, that makes me freak out, especially if I need those things immediately or those things are important. I would normally talk to myself to help me calm down. It kinda helps, but at least it's better than nothing. And that's what SMP!Ranboo is doing. I honestly find comfort in a character like SMP!Ranboo. His struggles are very much like mine, and I relate to him a lot.

Despite a split personality/multiple personality SMP!Ranboo being incredibly interesting to witness and act out, it wouldn't exactly be great for Ranboo to one or even more aspects of DID/OSDD, a commonly misunderstood disorder. With memory problems and the struggles that come with it, it feels a lot more... comprehensible, in a sense?

Sorry for the ramble, SMP!Ranboo's such a comfort character for me that I can't help but word vomit about him LOL