What if there was a ninja trick that let the ninja see in fog as in their smoke bomb and smoke pellets it could be a master trick that u would have to have smoke bomb and maybe darkvision for. and perhaps darkvision should be more like
This trick grants a ninja enhanced sight, granting darkvision out to a range of 60 feet.
other wise there's really no point to it just get darkvision permanency or just pick up a pair of Goggles of night 12000 g at level 10 is not that much, I dont know about everyone else but i am not paying 1 precious ki point just for an hour of darkvision when I can get something that makes me live longer :D
as it stands now i could be one level of Oracle and get Clouded Vision and Gaze of Flames (Su): You can see through fire, fog, and smoke without penalty as long as the light is sufficient to allow you to see normally. so a ninja would have to get a ninja trick that made it so they made enemy's in fog lose there dex bonus and allowed them to see through the fog to sneak attack
It's good early on, but something like a blindsight/blindsense upgrade would be kinda cool, so you could locate people in the mist through sound.
Yes, I agree that see unseen should be sense unseen and give you blindsight as a master trick.