Matthew "Matt" Horner is Jim Raynor's second-in-command and captain of the Allied Joint Navy flagship Hyperion. Horner has strong moral principles. He desires to make the multiverse a better place, and opposes the murder and torture of innocents. He is not only a fair combatant but also an excellent ship pilot and a decent starship tactician. He is more "clean cut" in terms of appearance/attire than many of the other Raiders. In Mira Han's view, Horner is tough in "his own rather odd and gentle way.