@Goldfish , I am tagging you because you are the mechanics guy, but this is for everyone. Onward, I think that we can decide on which skills Kori can focus on, and I think that we shoud max out these five to fill his mysterious shadow man persona:
-Bluff: our best social action, and represents our skill at intrigue
-Sense motive: because he is perceptive and canny, and his big thing that helped him to survive is reading people well
-Perception: again, he is perceptive and that prevents ambushes too
-Stealth: shadows are stealthy!
-Intimidate: once he gains control of his shadow, Kori weaponizes his curse into fear. Makes a strength out of his weakness. Also gives another way to socialize. A worse diplomacy, but one where he gets bonuses and mostly has the same effect due to his curse.
Other nice things I would like to have, but I don't think we will have the points to spare:
-Dungeoneering knowledge: because he is a local, so he should know plenty of things
-Gather information: for fun intrigue stuff!