Cluster A Personality Disorders: The three personality disorders in this cluster are characterized by distorted thinking, social awkwardness, and social withdrawal. Paranoid PD Schizoid PD Schizotypal PD Cluster B Personality Disorders: The four personality disorders in this cluster are characterized by difficulties with impulse control and emotional regulation. Antisocial PD Borderline PD Histrionic PD Narcissistic PD Cluster C Personality Disorders: The three personality disorders in this cluster are characterized by high levels of fear and anxiety. People in this cluster need lots of reassurance from others. Avoidant PD Dependent PD Obsessive Compulsive PD