Dunban is the brother of Fiora and was a high-ranking soldier of Colony 9 who was previously thought to be the only one capable of wielding the Monado. He used the Monado to repel the invading Mechon forces at the Battle of Sword Valley, one year prior to the attack on Colony 9. The Monado took a considerable toll on Dunban's health, causing his right arm to become almost completely paralyzed but he still fights with a katana in his left hand.
Dunban serves as the voice of wisdom and reason for the group and is willing to do what must be done. Those he seems tough and resilient, Fiora claims her big brother is actually a big softy and cries when nobody is around.