Confidence (or more accurately arrogance):
Narcissists tend to consider themselves "beyond reproach". This means that they aren't as weighed down by guilt or social graces as the rest of us. They tend to do stuff that pushes boundaries or crosses lines and they have this impressive way of talking their way out of trouble. They're usually so unapologetic, that the rest of us wonder where WE went wrong.
I have to add that the few times I've pressured an apology from them, it was followed by passive-aggressive behaviors, or repetition of the actions they apologised for.
Hot & Cold:
They tend to be very intense and engaging. They're good at being your best friend in short bursts and becoming your frenemy or straight enemy when you no longer entertain them. They can make you feel loved one day and then treat you like a nuisance they can't stand the very next.
This illustration is a perfect depiction in my opinion. They low-key put themselves on pedestals but they only manage to get treated like "Gods" when they pretend to treat their fellow men/women as equals. At least most of the narcissists I've met understand this.
Sympathetic (they have this way of attracting our sympathy):
They're really good at making your struggle, their struggle or just completely trumping your hardships with their own. They usually use this tactic to keep other people out of their spotlight but it has the added bonus of attracting attention from other people who overhear.
A lot of times they'll exaggerate or completely lie to keep our sympathies. Just think about it.. How likely are we to dispute people who come out and share their hardships/traumas, and how much attention do we give to those in need? We're more likely to dote upon those who suffer the most.
Pessimistic (at least outwardly):
They're very good at casting doubt and gloominess upon other people & their ideas. Especially if they feel threatened by someone else's success or a lack of validation.
This tactic also helps them to maintain their "larger than life personas". They set themselves up for success/to impress us by making situations out to be impossible/unbearable and then effortlessly shrugging those situations off.
They tend to cast a lot of negativity and doubt upon the people around them. Sometimes they do it to themselves in an attempt to fish for compliments & to appear humbled.