Master Chief

Master Chief Petty Officer John-117 is a fictional character and protagonist of the Halo universe, created by Bungie. Master Chief is a playable character in the trilogy of science fiction first-person shooter video games Halo: Combat Evolved, Halo 2, and Halo 3 and will appear in the upcoming Halo 4. Outside of video games, the character appears in novels - Halo: The Fall of Reach, Halo: The Flood, Halo: First Strike, and Halo: Uprising - and has cameos in other Halo media, including Halo: Reach, Halo: Ghosts of Onyx, The Halo Graphic Novel and Halo Legends. He is voiced by Chicago disc-jockey Steve Downes in the video games in which he appears.

In CAMEO!
Master chief is confirmed to be a playable character in CAMEO!