Well noted! Aside from the 3 main, some playable characters join the team for some quests as you probably already noticed. The plan is for there to be a new one added in a major side quest as well, and maybe for everyone to be recruitable at a whim in the post game. Most of the classes you found in the files are probably the default ones (from 0001 swordsman to 0008 bandit), which I kept as a guide for balancing my custom ones. And there're also the class changes as part of the story (we only had one so far tho).