If you want to know the character of a person you need to examine deeply how they interact with others when they think no one is watching.  Look at how they treat others that are "lower" in the organization than they are and how they use their position or title; both within the organization and outside of it.  Interact with those that interface with the person you are seeking to "know" and understand how they view this person.  It will be more insightful than any commentary you could get from the person themselves.

The truth of your character is expressed through the choice of your actions.  Anonymous

Bad company corrupts good character.  Menande

Be more concerned with your character than your reputation, becasuse your character is what you really are, while your reputation is merely what others think you are.  John Wooden