Many good qualities mentioned, many I agree to. To be great rather than good, I think you need all the qualities but BALANCED. You must completely understand your own limitations and how they may change day to day.
You must understand your machine, not so you can build it, name every part, or explain the physics of how it flies, but know it so that you can handle any of the surprises it may give you in flight.
Assuming that the cool guy or the natural leader is the best is dangerous. You have to be a leader, but you can be so purely on your piloting merits.
You have to set examples of how to behave in flight and after flight. Preparing for a flight begins with preparing yourself. Partying all night is normally not a good way to prepare yourself.
Too much to cover in a short posting. Basically, I think a balance of all good qualities is a good place to start.