So currently you can't delete classes, monsters or NPCs. There were times when I accidentally added new classes without wanting to. And after I create them, I can't get rid of them. (If players are playing the deleted class, the player will respawn and change to a different class.) I'm sure I'm not the only person who wants a feature like this, as it could help many players undo their mistakes.
#Deleting classes, monsters, etc
hot mulch
lean basin
Or maybe a toggle on/off for the classes like with the dungeons. So you can prep a class and launch it whenever you want