Which Heart class would be able, to some extent, visualize the emotions of others and influence them without *manipulating* them?

A Muse or a Seer/Mage sound like the most likely candidates. A Seer or Mage may offer advice and try to change others through their knowledge of Emotions, without outright ‘changing’ anything, but still leading up to a change, while the Muse could inspire emotions in others and be rather empathetic.