I disagree with you on this one smyle. People are born with and without certain character traits. Leaders have specific traits that people respect. People can change their habits and develop personality traits over time, but in the same way people are funny, shy, deceitful, etc., as children, people can be born with the character of a leader.
Saying people can be born with the character of a leader means you have already summed up in totality what the characters of a leaders are and once anybody exhibits these characters, then the person is a leader! It is funny you know?
There is no holistic characters of leaders such that these characters define them. These leaders are first human before what they show to the people. Just like we do not have single human nature, we cannot have specific traits of leaders! What we call trait are similarities and differences we have seen these 'leaders' exhibited in the past. Behaviour changes has you rightly noted so nothing says these people will have 1 thing that defines them.
They are not born! I still stand by my point that they are made based on experiences, material condition which affects their people, people around them or the helpless. This is borne out of consciousness.
Thanks!