There are as many traits of a leader as there ae lists of what makes a leader. Here are the fundamental traits of a leader from my perspective:
Has integrity. People have to believe that you are pursuing your dream because it's the right thing to do, not just because you are ego driven.
Is a people person. Understands the differences that make people unique and is able to use those individual skills to achieve the goal.
Is positive. A leader encourages and rewards people and makes you want to do it and do it right. A leader is not a negative person and doesn't waste time and effort tellng everyone what they're doing wrong.
A good leader would stay calm and think of solutions when under stressful situation. He would try to analyze the question and then try to fit the solutions to the situation. Only then they would start acting.