My epiphany to other players (just me talking some tips)

When you create a unique character NPC of your world, have you ever wanted to make a specific NPC be a class that shouldn't be commonly chosen by the player? but you also dont want to make your NPC in the monster section just to secure theur uniqueness? Well thank to Sigma_Wolf and their Warhammer Fantasy campaign, I saw they made a class simply called NPC, so thats my eureka moment, just make an NPC class and write whatever unique class in the subclass section for your special NPC character while letting players know this class/subclass is mainly for world building