Should've asked this question a couple of days ago, but totally forgot to. Anyway!

Is it possible for the spirits to possess those who are overly sensitive to them?

If a character can emotionally connect with the spirits, will their communication get better? Will they get an idea of what they may be trying telling them? And also, are these spirits part of the floating island setting, as we already have signs of people, are they perhaps connected to it or are they just random?