Ghost

A Ghost is a piece of equipment issued to each Guardian. Appearing as a small, floating drone, Ghosts can support the player by performing certain actions such as illuminating darkened areas, repairing technology from the Golden Age, and informing the player of incoming hostile threats. They seem to possess some degree of artificial intelligence, being able to converse with their masters in a very human fashion.

Trivia
The Ghost from the E3 2013 PS4 Presentation was voiced by Peter Dinklage.

List of appearances

 * Destiny