Nikola is self-obsessed, not that she's always thinking of herself she's just obsessed with the concept of a self. Being an aspect of the Stranger it is entirely inhuman. Nikola is sadistic, sarcastic and finds a hard time giving any kind of care to anyone. It's also dramatically evil, skinning people and kidnapping people. She is wholly dedicated to her fear. She also is a performer at heart and loves to be dramatic and leave people on edge and afraid.