What Are the Characteristic of a Leader?

I have seen this movie and was very inspired by it, I showed it to my wife and asked what she think about him, she said: "Nice guy, seems very smart and that he achieved some things in life, who is it?" and I said this is the "legendary investor Warren Buffett", a man whos fothern is estimated at 45 billion dolars, and a notable philanthropist, having pledged to give away 99 percent of his fortune to philanthropic causes!
This is my example of a leader...
, in this talk he says there are 3 important things in a leader, and at the end of the day its not about your graders, your Intelligence, you passion or your skills, its about integrity and your ability to create vibe around you and inspire others to do great things with you... its a person who give credit to others for his own success, a person who people love to love and a person who build thing's which are bigger them himself...
Two live examples:1. How to evaluate who will be successful? 
2. Another example of when he say "We" instead of "I" regarding a decision he made: http://www.youtube.com/watch?v=Lc791is6X0o