Hi, so non-playable characters are probably not really feasible right now. But until then, maybe we could find ways of 'talking' to characters that you can't see. Like say you want to have an NPC explorer working in an office in Pahts. There could be a doorbell or something you could press and then a sound effect voice could say like, "Could you please leave me alone, I'm working!" And maybe, I dunno, there would be a kitchen in the next room, and there would be a puzzle involving, I dunno, making a bowl of soup, and then the NPC would say like "Oh hey thanks, here's the password to my safe on Age Whatever." You know, something like that. He would be behind a closed door, so you wouldn't have to model or animate the character. Also, you could maybe do the same thing with a radio or another means of communication.
What do you think!