It is unknown which species she is. She is not a ghost as she tells Sally when Sally mentions she is a stronger ghost Ramona says "You still think I'm a ghost?" Since she hasn't aged, she might be a demon. Sally says Ramona is the evil personification of the house itself. She feeds off of the death that occurs in this house which is shown when she makes Josh kill all the people in his pack. She wants Josh, Aidan, Nora and Sally to stay in the house because of how much death they bring into the house.