How many roles does the President of the US have?

The president has seven key roles that they must fill, an eighth role comes with the job however and is commonly overlooked:

Chief of State - The chief public representative who in the US is also the ceremonial head of the government. The symbol of all the people of the nation.

Chief Executive - Invested with executive power by and through the constitution. Often described as "the most powerful office in the world."

Chief Administrator - The President is responsible for all federal departments, including cabinet departments, such as the State Department, and independent agencies, such as NASA.

Chief Diplomat - Main architect of American foreign policy and the nations chief spokemans to the rest of the world.

Commander in Chief - Gives the president direct and immediate control of the nations entire military aresenal as well as every man or woman in uniform (in the military).

Chief Legislator - Main architect of public policy, the president sets the overall shape of the congressional agenda.

The six above roles come directly from the "Constitution of the United States."

Chief of Party - The acknowledged leader of the political party that controls the executive branch.

and often overlooked:

Chief Citizen - The President is expected to be "the representative of all the people." The President is expected to work for and represent the public interest against the many private interests.