types:
agent
a representative who acts on behalf of other persons or organizations
alderman
a member of a municipal legislative body (as a city council)
assemblyman
someone who is a member of a legislative assembly
delegate
a person appointed or elected to represent others
emissary,
envoy
someone sent on a mission to represent the interests of someone else
business agent
an agent who handles business affairs for another; especially one who deals with employers
literary agent
an agent who represents an author in dealings with publishers
apostolic delegate
(Roman Catholic Church) a representative of the Holy See in a country that has no formal diplomatic relations with it
bailee
the agent to whom property involved in a bailment is delivered
deputy,
surrogate
a person appointed to represent or act on behalf of others
freight agent
an employee of a freight carrier who directs the receipt and delivery of goods
government agent
a representative or official of a government or administrative department of a government
handler
an agent who handles something or someone
legal representative
a personal representative with legal standing (as by power of attorney or the executor of a will)
mill agent
the responsible official at a mill that is under absentee ownership
next friend
(law) a person who acts on behalf of an infant or disabled person
parliamentary agent
a person who is employed to look after the affairs of businesses that are affected by legislation of the British Parliament
shopper
a commercial agent who shops at the competitor's store in order to compare their prices and merchandise with those of the store that employs her
shop steward,
steward
a union member who is elected to represent fellow workers in negotiating with management
special agent
someone whose authority is limited to the special undertaking they have been instructed to perform
walking delegate
a union representative who visits workers at their jobs to see whether agreements are observed