I have a degree in psychology and while it’s greatly exaggerated (as it is a fictional story), there are a lot of symptoms related to narcissistic personality disorder. It would be cool if the author was using it as a resource for material
Yes it definitely seemed like it was a reference for his character.
You have to take into account that most nobility in the real world were upheld by bullshit blood politics of them being close to God than human. So his behavior and personality is not that unfamiliar to royalty.
The lack of empathy, the preoccupation with power, his manipulation, his grandiose self perception ( he is the human among ants as he puts it), the way he gets easily bored, the way he feeds off excitement and chaos and even the fact that he can't remember names and faces well are all common symptoms of Narcissistic Personality Disorder.
Having encountered a real diagnosable narcissist....the ML is eerily familiar ( minus the blood shed ofcourse (⊙…⊙ ) ).