Hello Lemony
I first of all would like to say that I am NOT an expert! But sadly I have had a lifetime's experience with Ns, so I have seen most types.
NPD is on a spectrum...of course we all have narcissistic traits, otherwise we could not function in the world. However, when these N traits become the over-riding part of our being and our personality, to the exclusion of empathy and understanding of other's rights to autonomy, then these traits become a problem.
The person with the disorder, however, is not usually the one with the problem...it is the people who have to deal with that person who have the problem !!
Lists of traits are not helpful IMVHO. Usually they say things like 'grandiose'....well what does that mean really?
Also, there are several different types of Ns...my mother for example is a 'cerebral' N, whereas my sibling is more of a histrionic type. The other problem is that most Ns have other personality disorders running alongside their NPD, so this makes it even more difficult to look at a list of traits and say...yes..they are an N.
The only person who can truly diagnose a PD is of course a psychiatrist...but with NPD they have great trouble, as the N is skilled at lying and manipulation so can never be pinned down in therapy.
Of course, most Ns never, ever reach therapy, as there is nothing whatsoever wring with them is there? By definition they are perfect.
It is the rest of us mere mortals who end up suicidal and with depression etc who end up in therapy , needing to know what hit us.
Ns also have cognitive difficulties, and personally I think this is a huge part of their difficulties that is overlooked by most lists of traits.
All you can really say is that they are all different, but they are also all the same!
Hope that isn't too garbled!
Why do you ask? Do you think you know an N?