I wont bother to decorate this nor will I use my typign quirk 'cause that'll probably be hard to read. Also this is all a wip hi

Kei's DID & alter split

I also have DID. I'll refer to the 'idiot' alter as master, and the 'general' alter as chishou. ( since that's what they call eachother lol )
While master only appears after harukei graduate from houya senior, he's the "original" alter, the one who was there before chishou. Haruka mentions multiple times, "kei has always been a stupid kid" and, as shown in multiple scenes, the kei from before acts similarly to master. Todo said, "he changed himself". What does this imply? It means chishou developed as an alter because of kei's constant strive to make Haruka the best. Chishou is there because of baseball, because of playing with Haruka. He had always knew as a kid that Haruka is a genius who could be the best pitcher, with the right support. It's not uncommon for pwdid to develop alters based off of a specific need that the brain incurs. Chishou was formed because Haruka needed someone strong and smart, someone to take care of him. Chishou always tells Haruka to care only about himself, and not to mind others. Both Keis clearly care about Haruka the most, even if master didn't really like him at first because of his attitude. Memory loss and Memory gaps are very common symptoms of DID. From the start I've always suspected that Kei had DID instead of Amnesia. Especially when Chishou came out of dormancy, then when Master switched back and didn't remember. That's a very obvious 'alter switch' situation. for DID, you usually don't remember what happens when you're not in front, when another alter fronts instead.

haruka's dependency on kei, alongside the relationships he has with kei and others.

Haruka was a sensitive, shy crybaby as a kid. Kei was his first ever friend.