http://en.wikipedia.org/wiki/Narcissism#Traits_and_signs
A 2012 popular book on power-hungry narcissists suggests that narcissists typically display most, and sometimes all, of the following traits:
An obvious self-focus in interpersonal exchanges
Problems in sustaining satisfying relationships
A lack of psychological awareness (see insight in psychology and psychiatry, egosyntonic)
Difficulty with empathy
Problems distinguishing the self from others (see narcissism and boundaries)
Hypersensitivity to any insults or imagined insults (see criticism and narcissists, narcissistic rage and narcissistic injury)
Vulnerability to shame rather than guilt
Haughty body language
Flattery towards people who admire and affirm them (narcissistic supply)
Detesting those who do not admire them (narcissistic abuse)
Using other people without considering the cost of doing so
Pretending to be more important than they really are
Bragging (subtly but persistently) and exaggerating their achievements
Claiming to be an “expert” at many things
Inability to view the world from the perspective of other people
Denial of remorse and gratitude