Beowulf

An ONI Artificial Intelligence construct, Beowulf was the attaché to Admiral Micheal Stanforth and the UNSC Navy. He was present during the Spartans original briefing about the Covenant.

He was later assigned to guard the UNSC personnel and planning database. He knew Cortana well and knew that she was trouble. When she would try to get into the system, he would block her entrance.

He was thorough, methodical and paranoid. However, Cortana quickly cracked her way around his defenses to access SPARTAN-117's CSV. He was incapable of learning, due to the fact he was a "dumb" AI.

His holographic appearance was that of a man wearing a hooded cloak.

Trivia

 * Beowulf was probably named after the titular character of the famous heroic poem Beowulf, the only surviving piece of ancient Anglo Saxon heroic poetry.