A prior member of the Alliance’s mobile suit development team, all of whom disbanded and fled the project after completing the Tallgeese and designing Wing Gundam Zero, and eventually set up development on separate colony clusters and Earth. Tall, bald, and skilled in martial arts, Master O (Colony Cluster L5) is the Gundam Engineer who designed and constructed the Gundam Shenlong, and who directs the actions of Wufei Chang.