I'm probably going to delete this later but like as a system with a whole lot of littles ...

Im just hoping for a ton of character development for all of them. All the alters as well as the mc.
Glasses guy needs more confidence, evil guy needs to not be as evil anymore and the little need to be treated like a person instead of an animal.
And maybe at that point we’ll get somewhere somewhat healthy. But right now this shit is fucking toxic for everyone involved and it makes me very uncomfortable as well.

It’s not an alter though, this story has nothing to do with DID. Especially because it’s a whole ass mystical entity

And a mystical entity can’t have DID? What is it if it isn’t DID?

DID is a real condition that affects human beings. Mugo is a mythical creature who has lived for centuries and whose head literally transforms in smoke when a different character takes over. He can talk to other characters in reflections. It's safe to assume this is not meant to be an accurate depiction of DID. It's all magic bullshit

It’s still heavily inspired by DID and his magical power influences how it works. So saying „it has nothing to do with DID“ is wrong, I believe.
DID is hard to comprehend for people who have never heard of it. So most of the magical bullshit happens in order to make the audience understand what’s going on.
Him talking to other alters in the mirror is a tool to show the audience what’s happening in his head (also seen in marvels moon knight for example). Same goes for his magically disappearing/reappearing glasses.