* What they are motivated by [the motivation itself gives you clarity in their personality. Lack of motivation does as well. None are bad traits, they just reveal things]
* Posture and body language
* Eye contact and eye movement when speaking
* How they speak of other people, good and bad
* Lying [everyone lies. some people lie about important things]
* Reaction to criticism/blame
* Evidence of perseverance
* Dealing with silence [some people call them 'awkward silence'. That's pretty revealing ;D]
* Balance of aggressiveness and passiveness
* Ambition or lack thereof [no right or wrong here] * Levels of child-like enthusiasm for passions versus task driven enthusiasm
* Social interests [again, unsocial introverts aren't necessarily a 'bad' trait. Just something that adds to your personality]
* Instability
I just wrote those up then, it's hard to verbalize, admittedly.