Hello, I'm interested in speedrunning Attack on Titan 2, but I have Final Battle. I was wondering if it might be possible for some additional categories to be added.

yeah, thatll happen as i talk to more people that own the dlc as i dont actually own it myself. that discussion would probably take place in the discord.

Hello, what is the fixed catégorie ?

the fixed category is for the "Character Episode Mode". (If this has a different name in the french version, it is the mode where all of the missions are on a grid, ex: ) When playing Character Episode Mode, you are able to choose between fixed and open equipment sets.