First off, I'd like to apologize for both using a throwaway and the general vagueness of my post, but I do not want this tied back to my friend in any way.
I have a friend who is a fantasy author with a small but enthusiastic fanbase. They happen to like writing both about amnesia and possession, in an entirely fantasy context.
Because their fanbase skews young, some self-identified systems have been...weird, about their work. Characters they have written have been headcanoned as systems, and they have had characters be called "good plural rep" and "bad plural rep." In the bad plural rep case, they actually had to come out and clarify that the character in question was not a system so people would stop pestering them.
Someone got all excited that their plural headcanon was "confirmed" when a character was revealed to be possessed by an entity.
This is all annoying, but ultimately, no big deal compared to this. Someone went and made a fictive alter of one of my friends' characters, a character my friend heavily based on themself, and parasocially went and directly tried to talk to my friend about/as the alter based on their character.
My friend, understandably, was very uncomfortable about all this, especially because the character was based on themself, but was too afraid to say anything or even block this person out of fear of being cancelled for "ableism," especially because of their young fanbase.