Narcissist's obsession is SELF, which is a four letter word. Narcissism is a personality disorder characterized by an excessive need for admiration and an inflated sense of SELF-importance. People with this disorder often have an obsessive focus on themselves and their own needs, and may be preoccupied with their physical appearance or accomplishments. As a result, they may be unable to empathize with others and may have difficulty forming meaningful relationships.