...from the attached description by the Cleveland Clinic...
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Narcissistic personality disorder is a mental health condition. It affects a person’s sense of self-esteem, identity, and how they treat themselves and others. It’s more than arrogance or selfishness. In the worst cases, people with NPD may struggle with feelings of failure or rejection, putting their own health and well-being at risk.
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btw, "Malignant Narcissism" can involve Anti-Social, Paranoid and Sadistic personality traits...so, while this personality might work well for an Autocrat, it doesn't in a Democracy.
Link: https://my.clevelandclinic.org/health/diseases/9742-narcissistic-personality-disorder