King is a textbook case of Malignant Narcissistic Personality Disorder (NPD), which is a combination of NPD and APD:
The DSM-5 lists nine traits that help identify NPD, but only five are needed for diagnosis.
Common symptoms of NPD include:
grandiose fantasies and behavior, such as a preoccupation with thoughts of personal success, power, and attractiveness or sex appeal
little or no empathy for other people’s emotions or feelings
a significant need for attention, admiration, and recognition
an inflated sense of self-importance, such as a tendency to exaggerate personal talent or achievements
a belief in personal specialness and superiority
a sense of entitlement
a tendency to take advantage of others or exploit people for personal gain
arrogant or conceited behavior and attitudes
a tendency to envy others and believe others envy them.
Anti-social personality disorder traits:
Only adults are diagnosed with APD. A diagnosis requires at least three of the following symptoms:
disdain for authority and social norms, shown by continued illegal or lawbreaking behavior
a pattern of deceit, including exploitation and manipulation of other people
reckless, impulsive, or risky behavior that shows disregard for personal safety or the safety of other people
little or no remorse for harmful or illegal actions
a generally hostile, irritable, aggressive, restless, or agitated mood
a pattern of irresponsible, arrogant, or disrespectful behavior
difficulty planning ahead
https://www.healthline.com/health/malignant-narcissism#traits