Slag Twelve was a male Mandalorian clone pilot. He was created on the planet Kamino. A member of the starfighter squadron, Slag Squadron, he participated in the Battle of Toola and survived the battle. He was a wingmate of Slag Nine, Slag Ten, and Slag Eleven. Slag Eleven was usually the best of the rookie pilots and was often called the "Runt" due to the fact he had yet to prove himself in battle.