A mercenary is a person who does not have an alliance with any particular faction. Mercenaries tend to concern themselves with net gain over the ideals of a given government.
The meta game
Mercenary Corporations are player run groups which compete against one another for control of the boarder worlds. Merc Corps compete against one another through a contract system provided by the House. The Merc Corp with the highest bid at the end of the blind auction plays a series of matches against the defending Merc Corp for the occupation rights of the planet. Ownership of a planet provides a substantial bonus to the owners. Each Mercenary Corporation also earns Loyalty Points (LP) for assisting a certain faction. If a player is inactive for an extended period of time the LP will begin to diminish until they reach their neutral value.