How To Easily Identify the 4 Types of Borderline Personality Disorder (BPD): discouraged borderline, self-destructive borderline, impulsive borderline and petulant borderline. To spot the four types of borderline personality disorder (or BPD), it is important to look at the symptoms, causes and signs of these types to better understand how it is classified. Someone may have or suffer with BPD but not identify completely with these types of borderline personality disorder, that isn't to say you d