You don't think there could be a some kind of talent that is more directly associated with luminosity than being unreadable? Bella's thoughts, motives and feelings do not appear to be at all hard to read by conventional means. In fact, she seems to make a more than typical effort to make herself transparent.
Something Bella does seem to be good at is analysing the future impact of her decisions. That could lead to a more self-focussed version of Alice's talent. You could quite reasonably just palm off Bella's ability to Alice and use a modified version of Alice's talent for a fanfiction protagonist. Of course, if Bella's ability actually was closely related to luminosity it would defeat a lot of the point of the story. If she was luminous via super-power then we wouldn't be able to watch her putting in the effort to be self aware and rational manually. She would probably also experience a similar effect to Edward. He lost his ability to empathise effectively when he became a mind reader.
If she was luminous via super-power then we wouldn't be able to watch her putting in the effort to be self aware and rational manually.
I was implying that she was super-powered via luminosity, which I don't think informs the same concern.
In the vein of the Harry Potter and the Methods of Rationality discussion threads this is the place to discuss anything relating to Alicorn's Twilight fanfic Luminosity. The fanfic is also archived on Alicorn's own website <strike>(warning: white text on black background)</strike>.
Previous discussion is hidden so deeply within the first Methods of Rationality thread that it's difficult to find even if you already know it exists.
Similar to how Eliezer's fanfic popularizes material from his sequences Alicorn is using the insights from her Luminosity sequence.
Spoilers for the fanfic itself as well as the original novels need and should not be hidden, but spoiler protection still applies for any other works of fiction, except for Harry Potter and the Methods of Rationality chapters more than a week old so we can freely discuss similarities and differences.
EDIT: Post-ginormous-spoiler discussion should go to the second thread. (If you have any doubt on whether you have reached the spoiler in question you have not.)