representative — a person or thing that represents another or others.
emissary — A person sent on a special mission, usually as a diplomatic representative.
herald — (formerly) a royal or official messenger, especially one representing a monarch in an ambassadorial capacity during wartime.
messenger — a person who carries a message or goes on an errand for another, especially as a matter of duty or business.
diplomat — a person appointed by a national government to conduct official negotiations and maintain political, economic, and social relations with another country or countries.
ambassador — An ambassador is an important official who lives in a foreign country and represents his or her own country's interests there.
legate — an ecclesiastic delegated by the pope as his representative.
deputy — A deputy is the second most important person in an organization such as a business or government department. Someone's deputy often acts on their behalf when they are not there.
delegate — A delegate is a person who is chosen to vote or make decisions on behalf of a group of other people, especially at a conference or a meeting.
minister — a person authorized to conduct religious worship; member of the clergy; pastor.
agent — A chemical that has a particular effect or is used for a particular purpose can be referred to as a particular kind of agent.
bearer — The bearer of something such as a message is the person who brings it to you.
carrier — A carrier is a vehicle that is used for carrying people, especially soldiers, or things.
consul — A consul is an official who is sent by his or her government to live in a foreign city in order to look after all the people there that belong to his or her own country.
courier — A courier is a person who is paid to take letters and parcels direct from one place to another.
intermediary — an intermediate agent or agency; a go-between or mediator.
internuncio — a papal ambassador ranking next below a nuncio.
nuncio — a diplomatic representative of the pope at a foreign court or capital: equal in status to an ambassador.
plenipotentiary — a person, especially a diplomatic agent, invested with full power or authority to transact business on behalf of another.
vicar — Church of England. a person acting as priest of a parish in place of the rector, or as representative of a religious community to which tithes belong. the priest of a parish the tithes of which are impropriated and who receives only the smaller tithes or a salary.
attache — An attaché is a member of staff in an embassy, usually with a special responsibility for something.
charge d'affaires — A chargé d'affaires is a person appointed to act as head of a diplomatic mission in a foreign country while the ambassador is away.
