Who created npc?

[Rafe]

Who started programming them at first, and it he still working on them? What are his plans for them?

[Soyweiser]

Whales (whalesdev).

No. And he has no plans anymore. He is not working on CDDA.

Edit:
Your question is not that useful. Think you might want to know who is working on NPCs right now, and who added the additional quest line to NPCs. I have no idea myself.

[i2amroy]

Acidia was the last person to work on NPC’s IIRC. They tend to be a map person, but aren’t afraid of building quests that involve their map locations. The Sarcophagus, for example, is another of their additions to the game.