@cicerone imposter,
I don't think I remember any narcissists in my lifetime of knowing real people personally; I'll have a look-see in my memory, but no one is presently standing out. Call me lucky!
I don't know all the clinical details for narcissism, haven't looked them up lately. I'm no one to diagnose in any case, but I do notice his behaviors. I see Farmerman's take re adhd as well possible; I do see the rather limited vocabulary floatings reported to be in tweets; I've no idea if that relates to adhd, except as a maybe (one of my cousins was an expert in all that). I see the reluctance to read, and thereby think, as, so help me, amazing.
I see the con type of behavior, however that grew and flourished, maybe family background (but we all have family background or if not family, some caretaker(s) as children).
I think of him as stupid, but that's not right, as he is fairly wily.
All of this is mysterious conjecture, but the real mysterious part is why did this guy get to be president.
I think I can connect that with some of nimh's recent posts.