couldn't have put it better myself, drag!
i can see i've chosen well by appointing you my right-hand dragon...
the only thing i can really add to what she said is that SCs tend to have a connection [usually quite a strong connection] with a person's main character, such as Best Friend, Mentor, Arch Enemy, Pet, etc, whereas NPCs have no particular connections to any characters, and tend to be normal townsfolk of Pyke [our village].
so, basically, newsie, that sloggie would be an SC rather than an NPC, okay?