“fictional AI CP” isn’t a thing. AI is trained on existing data. It does not create new stuff. If you want AI to generate CP then you have to train it on CP.
The same way the pictures of ninja dinosaurs can only be trained on actual photos of ninja dinosaurs, right?
AI can create faces and bodies that have never existed. From there it might just take a lot of prompt engineering, but to say you have to train it on CP is false.
Edit: Also that’s only considering life like CP. There’s the whole cartoon/manga side of things which IS purely fictional at all times but will get you sent to prison if transmitted over an open carrier.
Can create faces that have never existed, but can you guarantee that the child in a CP that it has created does not look identical to a child that already exists? after all it can very well produce something using children directly from or very similar to its training set.