What type of leadership skill is based on a person's unique attributes, such as expertise or charisma?

There are many attributes and facets to leadership. In order to be a good leader, you need to embody these so that you are a valid, legitimate leader to your followers. Credibility is based on a leader's expertise and charisma, and is very important to have, so that followers never doubt their leader and have no qualms with obeying them.