Monster who, unbelievably, is still on hold

Monster who was shot through the heart, and you're to blame

Monster who is finally getting to the heart of the matter

Monster who broke someone's heart

Monster who is jack of all hearts, denizen of none

Monster who is the ruler of hearts

Monster who has too many damn hearts

Monster who's too big-hearted

Monster whose heart grew three sizes

Monster who has a heart, and that's a problem