Heart the Healing Demon ♡

Heart is a healer Demon, and Moon's older sister, Heart heals pure humans on the verge of break, she uses the chains on her hips to harvest the pain and suffering parts of a pure soul that's breaking.
 
Heart doesn't go after those humans who have caused others pain and suffering though, because she leaves that to her little sister Moon, so Hearts main goal is to make sure she finds those pure souls that the evil souls have broken, she can easily track those pure souls down thanks to the evil souls moon collects, as Heart can read those evil souls and who they've destroyed.