Xiahou Dun is Cao Cao's cousin. He appears as a bearded, fearsome and charismatic general. He is a just and honorable man, but hot-headed and ruthless in his attempts to help Cao Cao achieve the ultimate goal of conquering China. He loses his left eye at the Battle of Xia Pi and remarks at how the event helped him to "see" how arrogant he had become. In Dynasty Warriors 5 Xiahou Dun's Musou Mode focuses on his hatred of Guan Yu.
Source from Wikipeida