Narcissists are charmers and very good at stroking the egos of those they wish to suck into their web. They will tell you everything you want to hear and more. They will be your very best friend, the one who comes to your aid when needed, rushes to bring you food you didn't ask for, and speaks highly of you to anyone who will listen (at first). They are so enchanting; you will be floating on cloud nine, wondering how you got so lucky to attract this incredible human who seems to "get" you. But that's the rub. They don't actually get you, far from it. Empaths and narcissists are opposed, so they could never get you.
Let's start with the basics. Energy vampires are usually lower vibrating individuals who feed off the life force energy of higher vibrating people. This is sometimes being done on a conscious level but often times it's unconscious. On a spiritual level, they are likely souls contracted to come here and force you (the empath) into learning to love yourself. After all, that is what most empaths are here to learn; love of self. I like to call them the teachers in the negative space.