Hey everybody! I am not sure if this is super helpful to anyone but I just wanted to share that you can use a fountain pens for the essay section of the AP Literature exam. I just finished with it and I used my Lamy 2000 M nib with Lamy Black ink. I experienced limited feathering, no bleed through, and limited ghosting. Overall, it worked pretty well and I would recommend it if any else wants to try it.
Edit: I received my score so I can confirm that fountain pen ink shows up on the scantron
I have found that with the different ap papers for different subjects. The paper used for lit and lamy seems to be of higher quality than what is used for stats or econ