Yep, renaming the character folder progressed to this:
WARNING: No sprites found in directory: Characters/dlc_carmen/Character
Well, and of course the alt skins starting the struct.ini error. From that point, I just tried renaming the Character folder to lowercase. Instant crash, lol.
Having zero knowledge of GSM2 before I say this, would sanitizing all the paths you check and load to lowercase fix this?
Also, as a side note, I’ve run the game in Proton since making this post, and I’ve noticed the Linux version seems to be missing some visual effects.