Master Chief (Halo)
MCPON John-117, or "Master Chief", is a fictional character and the protagonist of the "Halo" fictional universe created by Bungie. Master Chief is a playable character in the series of science fiction first-person shooter video games "", "Halo 2", "Halo 3", "Halo 4", and "". Outside video games, the character appears in books and graphic novels—"", "", "", and ""—and has cameos in other "Halo" media, including "", "", "The Halo Graphic Novel", "Halo Legends" and "".
Arbiter (Halo)
In the "Halo" science fiction universe, the Arbiter is a ceremonial, religious, and political rank bestowed upon alien Covenant Elites. In the 2004 video game "Halo 2", the rank is given to a disgraced commander as a way to atone for his failures. Although the Arbiter is intended to die serving the Covenant leadership, the High Prophets, he survives his missions and the Prophets' subsequent betrayal of his kind. When he learns that the Prophets' plans would doom all sentient life in the galaxy to extinction, the Arbiter allies with the Covenant's enemies—humanity—and stops the ringworld Halo from being activated. The Arbiter is a playable character in "Halo 2" and its 2007 sequel "Halo 3"; a different Arbiter appears in the 2009 real-time strategy game "Halo Wars", which takes place 20 years before the events of the main trilogy.