I have used AI to RP some stuff (don’t ask), and while the higher end models, and even the better self hosted models are really good at answering in a way that makes sense and works in context, it is pretty hard to make them do anything, new, interesting, or unexpected, without prompting it specifically.

Nothing that I’ve seen playing around with LLMs makes me think that a well-written work of fiction could be improved by including them, unless there is a significant leap in capability.

And this is ignoring all the discussion about LLMs and copyright/stolen content.