Son of the classic folklore Aradia.
A demon or a fairy, Meallán himself isn't quite sure. All he knows is he can only find sustenance by feeding on the fears and nightmares of others.
Blood and flesh doesn't do much for him, he just likes them very much. Meallán has a physical body, but his form is always based on someone that the viewer recognizes. Meallán can draw people from any member in a group and project the person most of them would trust. Technically a spirit - he is one of those in between creatures that is a spirit with flesh.