This is now the fifth time I'm appearing in your ask box but I promise I won't leave y'all alone.
Alright, so this is how I personally imagine how Slim Shady became a person.
Marshall had a lot of problems and he couldn't heal any of it with the help of medicine and doctors. He was desperate to finally get rid of Slim Shady, the addiction and all other bad aspects of his life. Desperate enough to believe that maybe a separation would help.
He read about it in an old book and decided to try it out. "If it works if works, if not then not."
The problem came right afterwards.
He did not finish the text. He did not reach the part where it was said that all the things you will try to separate will become a person on it's own. So he was not prepared for a blonde man with icy blue eyes to be there.
But Slim Shady was there and Slim Shady would not leave.
Now Marshall got rid of his problems but now they're a person on their own. So basically in the end, they were still there.
But somehow, it was easier to deal with now. He understands Slim, after all he created Slim. So it was easier to help Slim get sober and understand the world than to do it on his own.
In the end he was kind of grateful for not finishing the text about the ritual.
Because who knows if he would've done it if he knew what would happen.
I read the first two sentences and you caught my attention. This is actually sweet and would make a really good fanfic. It also fits with those crazy conspiranoid theories about Em being a satanist or just being into rituals and stuff like that 😆
Honestly when it comes to these things I don't focus too much in the logistics and just go with any silly explanation I can think of. For example, I like to go with the "cloning theory" and picture all of Em variants just living together in the same place with him so he doesn't feel lonely, since his kids don't live with him anymore. They also help him when he has writer's block.
Other times I go with the interdimensional/time portals Em likes to use in his MV's, I think it's canon in the Emverse that his variants are able to go to other realities. At least Shady does it all the time, he even tried to battle-rap B-Rabbit once. I don't know, I think it's funny.
I like that you wanted to give an actual context as to why Shady became his own person. It's really interesting.
It takes what is said in The Monster, and makes it literal.
“I'm friends with the monster that's under my bed, get along with the voices inside of my head”
I love that song, and I think it's funny how we see Shady and Marshall facing each other in that music video as well (I will definitely be mentioning this again in the future).
Thanks for sharing, feel free to keep sending me your thoughts :)