In Ebron - the elf wandering near Treehouse,
In Red Keep - The solider on roof of right side of building by climbing the ladder,
In Thremten - A guy in the house where healer (cleric) stands in front of the door.
In Capital - Two women having a conversation in the Inn.
Paverhill - Woman standing in front of fireplace inside building near left entrance.
There is one more person , A Elf who is searching for the secret hot spring just like you somewhere in begus.
That's all I can remember , Check on the end of the path on left side of gambler in Calbridge Stronghold if you found most of the NPCs.