Ghost QF-4000 is an unmanned combat support variable fighter drone in Macross Frontier. It is not a human character, but a military machine used by the Frontier fleet for high-speed aerial combat and defense operations. The QF-4000 Ghost serves as a dangerous autonomous weapon, often deployed to intercept enemy forces and provide tactical superiority in battle. Its role in the series highlights the advanced technology and mechanized warfare that shape the conflicts in the Macross universe.