Dissociative identity disorder and Coventry
I read this story at least 10 years ago, but it might be older than that. I don't remember whether it was a full novel or a novella, but I think it was "too rich" to be a short story or a novelette.
It was about a person suffering from a very severe dissociative identity disorder, with a large number of personalities.
The reason the story was considered SF&F is that contrary to usual DID (if it really exists, this being controversial in "our" world) where each personality has no knowledge of the others, the many personalities did interact in the characters's mind. A sizable part of the story takes place "inside the skull" of that character, but probably not all of it. I think I remember also interactions with other characters, psychiatrists and/or psychologists, maybe other DID characters with less severe conditions.
I don't remember many details. 1012
I think that some personalities were male and other ones were female. I don't remember the gender of the body. But one point is really very clear in my memory, because of the peculiar use of the word "Coventry", which I had to look up.
One of the personalities was such a dangerous criminal that all the others united to prevent him (yes, that one was male, I am sure) to "take over" the body of the person and they called this "sending him to Coventry". It is not clear how they manage to do that.
At some point in the story, there is an "outside the mind" crisis, and IIRC, the many personalities had to call the criminal one for help, while still trying to prevent him from taking over, but out of "Coventry" (or else some other personality, possibly a female one, went to "Coventry" to meet him and ask for advice, I'm not sure).
This was a very, very weird story, with so much of it "inside" the mind of a DID person...
This story is definitely not "Coventry" by <PERSON>. Here Coventry is not a real place, but a "place inside the mind" of a DID character. 1012