Characters who are spirits themselves will feel the same vague feelings of unpleasantness, perhaps a bit more strongly than non-spirit characters, in the beginning. However, as the spirits begin to grow stronger, it is entirely possible that spiritually aligned characters can begin to get more than just vague feelings and begin communicating with them (in limited ways, since spirits don't exactly "talk"). For information on what the Filial spirits are like, see here. Ones not named in that list are around for this event, but talking to them would be nigh impossible. They're chaotic, conflicted, aggressive, and not willing to speak with anyone, even a fellow spirit.