Yao Fei was formerly a member of the People's Liberation Army, wanting to become a doctor. Unfortunately, he was used as a common soldier and forced to kill the enemies of the state. After refusing to kill any more people, he was labeled a deserter and shot. He escaped and awoke, healed, on the bed of local physician.
The physician was the father of Tenzin Cering, the unarmed man Yao had just killed. Tenzin was next in line to become the Accomplished Perfect Physician, a man with the memories and abilities of all his predecessors. Instead, Yao was chosen to be the seventeenth Perfect Physician. After this, Yao used his powers for good while remaining an renegade and enemy of the state.
However, when he realized that he could do more by joining the Great Ten, he became a member of the team, playing the role of diplomat and trying to keep the team from doing any senseless slaughter.
Yao Fei along with the rest of the Great Ten were created by writer Grant Morrison and artists JG Jones and Joe Bennett.
Yao Fei can use his voice for healing or for harm. He has been seen creating physical or mental paralysis, force fields, healing, destruction of matter, and earthquakes. He may be able to use other powers, but we have not seen them yet.
Yao Fei appears on the CW show Arrow, based on Green Arrow, played by Byron Mann. In the show, he is still a Chinese Army deserter with medical training as his comic counterpart, however he does not posses any super-human powers. He is stranded on the same island, a former Chinese prison, as Oliver Queen, and saves his life during Queen's first few days on the island. The island turns out to be occupied by mercenaries lead by Eddie Fyers, who captures Yao Fei and forces him to work for them by keeping his daughter, who is a version of Shado, captive. He is forced to take credit for Fyers' crimes through a video, and is then shot by Fyers once he is no longer useful.