People with narcissistic personality disorder (NPD) often have fragile egos, may not tolerate any form of criticism or failure, demand a lot of attention, and show a lack of empathy. When you're dealing with someone with NPD, the key is to set firm boundaries on things that you aren't willing to compromise on and remain consistent. A lack of empathy for others (being selfish/self-centered), or low or inconsistent empathy A lack of insight Arrogance Superficiality Grandiosity A constant need for attention and/or external.