Emotivore

Emotivores are undead that come into being when someone dies in the throes of intense feelings, especially among a large group of people experiencing similar emotions. An emotivore can take on a variety of anthropoid shapes, but its true form is a gaunt version of the creature whose death triggered its birth.
An emotivore manipulates and deceives to evoke feelings it can psychically feed upon. It chooses its appearance based on information it gleans from potential victims, assuming a shape that evokes a passionate response.