Mao is a Chinese orphan who was given the power of Geass by C.C. at the age of six. His power allows him to hear the surface thoughts of anyone within a 500-meter radius, regardless of obstructions or eye contact. Mao's Geass, as a result of continued use, is present in both eyes, and permanently active; as a result, the constant influx of thoughts from all around him drove him insane. C.C. claims she abandoned him because he was not able to fulfill his part of their contract. In order to compensate for his uncontrolled power, Mao wears sunglasses to disguise his eyes and headphones which repeatedly play recorded words of encouragement and gratitude from C.C. in an attempt to block out the thoughts of those around him. As a result of his lack of human contact, Mao is a fairly childish person, a fact only amplified by his insanity. The inability to read C.C.'s mind allows Mao to find solace in her, eventually developing into a childish form of love. He refuses to accept that C.C. doesn't love him in return and pursues her relentlessly to the point of obsessive love. When Mao finds C.C. in Area 11, she tries to get rid of him after Lelouch argues that killing Mao would have been more humane. However, she fails and Lelouch saves her, using his Geass to use the local law enforcement, and make them shoot Mao. Mao survives with the help of Britannia's advanced medicine. After escaping custody, he then kidnaps and holds Nunnally hostage in the lower levels of the Ashford Academy, hoping to lure out and eliminate Lelouch in an elaborate game. Lelouch collaborates with Suzaku and devises a strategy to rescue Nunnally resulting in Lelouch Geassing Mao to never speak again. As Mao tries to escape, C.C. fatally shoots him in the neck with a silenced pistol. [From Wikipedia.]