I am trying to adapt a character who can see spirits continuously to Pathfinder.
I looked all over the d20pfsrd site for a feat or supernatural ability that lets a character continuously see ethereal or incorporeal beings as if seeing normally rather than having to cast a spell. The closest things I can find are the Ghost Sight trait from Wayfinder, but it seems pretty vague and more like just knowing a ghost or spirit is still there; and the medium's Spirit Sense (from Purple Duck Games) and the Aetherurgist oracle archetype (from Rite Publishing), but these seem to need to be cast rather than being an innate sense like Darkvision.
I don't know if anyone has tried this before but basically think of characters that don't really choose to find ghosts, they just see them when they are there (like in the movies The Sixth Sense and ParaNorman). I don't know if it counts as overpowered either.