How would you identify a leader from a group?

How would you identify a leader from a group?

A leader is generally a person with charismatic personality & full of confidence. A person who takes initiatives in every task & always motivates other members to complete the task in time. He is a person who readily assists everyone to achieve their goals. A leader also has the courage to take the accountability for a failure. He is the person who takes decisions for the group & guides them accordingly. A leader is very ambitious & constantly strives hard for improvement & success of both the individual as well as the organization.