Spartan-B312, also known as Noble Six, is a central character in the video game 'Halo: Reach' from the Halo franchise. As a member of Noble Team, Noble Six is a highly skilled Spartan-III supersoldier assigned to critical missions during the Fall of Reach. The character is intentionally left ambiguous and customizable, allowing players to project themselves onto the protagonist. Noble Six is known for their combat efficiency, adaptability, and significant role in the defense of planet Reach.