Most of the NPCs of this game are part of a Quest, even if you just need to talk to them once. They can be part of a big Quest or can be the single NPC of a Daily Quest. These will oftenly give you a reward at the end of a Quest but that isn't always the case.

Tulimshar	Hurnscald	Nivalis	Graveyard	Others
	Alan		Hamond
	Arkim		Thrustan
			Wolfgang