Here is a list of some traits of NPD (with detailed explanations), some of which I’ve never heard of, but make sense/or I have noticed (the tendency to not have opinions of their own is included here). Some are truly strange but accurate:
Odd sense of time/no sense of the passage of time.
Unusual/bizarre eating habits
Strange work habits
Bad gift givers; stingy
Lacks a sense of humor/doesn’t get jokes (but are often meanly sarcastic)
Naive and easily taken advantage of (!) — actually makes sense because they are oblivious to what is going on around them
Complain all the time; negative and pessimistic
Passive, lack initiative
No opinions of their own
Can’t follow conversations
May look much younger than they are
Self-sabotaging impulsivity
Occasional moods of giddy euphoria (not to be confused with real happiness — which is alien to narcissists)
Lucky Otters Haven 
These seem like weird traits until you actually live with a Narc. My estranged husband has many of these and after 13 yrs, of marriage to him, these traits began to seem normal. Now that’s weird 😉 Thanks for the list Lucky Otter 🙂
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About the eating strange things — my MN ex used to eat Milk Bones dog biscuits (he’d actually buy a box for himself).
But I myself used to chew rolled up little bits of paper and eat confectioners sugar out of the box. Only I stopped doing those things in my teens. I used to eat that school paste in kindergarten too, but it was sugary and I was only 5. It’s probably normal for kids (even teens) to eat odd things, but if an adult does it, there’s something strange.
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Yeah, that is an odd one. I am not sure if the estranged one ate weird stuff.. he would make strange concoctions, soak onions and apples in vinegar and eat them.. is that strange? Maybe I guess… Milk Bones… definitely strange.
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