Been playing around with Chat GPT and it's fairly useless for editing fiction. So far.

However that's without a trained AI system and coding is well beyond my purview. It may have some useage in building descriptions of RPs or speeding up the process.
I think it's worth investigating.

The prose it is capable of is very basic, because it doesn't have a voice, and it's almost always positive, oddly. At least so far.

It can analyze writing quite well and it can probably suss out some themes in your writing if you don't realize them.

moosechangerpat highly relevant to you

This might be relevant to your interests https://beta.character.ai/