a person who helps another (especially as a deputy or as a junior worker)

helper

a person given a responsibility (especially a representative sent to a meeting)

representative, often governmental

a person who is (to be) given another person's authority etc

assistant, agent

a person who helps

assistant

a faithful supporter, especially one who obeys without question the orders of a leader

follower

an army officer below a captain; junior officer in the Navy

assistant

a person who is nominated for an office or appointment

candidate

a person appointed to command others in the armed forces, the police force etc; a person with a (public) position of authority

person who has high position in