Hello, I'm here to share my heavy projection onto Ivan
Ivan is an OSDD system, with "Ivan?"/Shadow faced Ivan being an alter, as well as The Tumor, and maybe also his "dad" (but I personally see his "dad" as either the Tumor or a hallucination)
Ivan also age regresses due to having a heavily traumatic childhood, which he doesn't remember, so he assumes he had a perfectly normal one. There's also a little in his system, but she's not allowed to front around others (like Andrew or Ivan's mom) due to fear of them being seen as weird
Shadow faced Ivan has his own name, being Issac, and the little dubbed herself Icing. The system has a little joke of everyone having a name starting with I, with the Tumor technically being an exception, but Ivan and Issac call it "It" just to fit the naming scheme
No one knows Ivan is a system, except his therapist if he had/has one (depending in your own au or whatever :p )
Uhhh, I intended on doing more than just system related, but my brain doesn't want to focus on writing more, so there you go! BTW, this is written by a system that has Ivan and Issac as altered, hence the whole concept lol
Ooooohhh, this is a really cool idea! There's so many things you could do with it. Systems in general are pretty interesting to me/pos