The following NPCs are currently factionless:
Tralinda
Lorud
Brundar
Grinda
Hruthgar
Aija
Rondel
Tabitha
According to
here and
here
They should take hits to:
Qeynos Guards
Priests of Life
Priests of Thunder
Karana Residents
They should also be assisting each other. There was mention of their primary faction is The White Rose (barbarian rogue guild), but I'd wager they're just Karana Residents as primary.
They should drop some coin typical for the level, sometimes have a fishing spear, occasional word, etc.
Also of note, the Jonah Brucker hermit in zone, should be KOS to everyone but Prexus worshippers with a pretty large aggro radius. You even get near his dock, and he should be running out swimming into the water kicking your ass. Mentioned
here.