Characters

Spartans

 * SPARTAN-034: Samuel
 * SPARTAN-043: William
 * SPARTAN-058: Linda
 * SPARTAN-087: Kelly
 * SPARTAN-104: Fredric
 * SPARTAN-117: John -The Master Chief

Artificial Intelligence

 * Cortana
 * Melissa (I Love Bees)
 * Araquiel
 * Deja
 * Doppler
 * Kalmiya
 * Lysithea
 * Solipsil
 * Wellsley

UNSC Navy

 * Lord Hood
 * Admiral Micheal Stanforth
 * Vice Admiral Danforth Whitcomb
 * Vice Admiral Preston Cole
 * Captain Jacob Keyes
 * Commander Miranda Keyes
 * Major Easley
 * Captain Carol "Foehammer" Rawley
 * Ensign William Lovell
 * Chief Petty Officer Mendez
 * Tech Officer Sam Marcus
 * Petty Warrant Officer Shiela Polaski

UNSC Marines

 * Major General Nicolas Strauss
 * Major Antonio Silva
 * First Lieutenant Melissa McKay
 * Sergeant Major Avery J. Johnson
 * Master Sergeant Gunns
 * Staff Sergeant Marvin Mobuto
 * Sergeant Banks
 * Sergeant Stacker
 * Corporal Perez
 * Corporal Locklear
 * Private First Class Wallace A. Jenkins
 * Private Chipps Dubbo
 * Private Manuel Mendoza

Office of Naval Intelligence (ONI)

 * Colonel James Ackerson
 * First Lieutenant Elias Haverson

Civilians

 * Dr. Catherine Halsey
 * Dr. Robert Mclees

Prophets

 * High Prophet of Truth
 * High Prophet of Mercy
 * High Prophet of Regret
 * Prophet of Supposition
 * Prophet of Disdain
 * Prophet of Pity
 * Prophet of Grief
 * Prophet of Glory

Elites

 * Arbiter
 * Half-Jaw - SpecOps Elite Commander
 * Zuka 'Zamamee - SpecOps Elite
 * Isna 'Nosolee
 * Orna 'Fulsamee
 * Bako 'Ikaporamee
 * Ado 'Mortumee - Council of Masters spy
 * Noga 'Putumee - Field Master
 * Soha 'Rolamee - Council of Masters member
 * Huki 'Umamee

Brutes

 * Tartarus
 * Bracktanus

Grunts

 * Yayap
 * Linglin
 * Zawaz
 * Gagaw
 * Mehmep

Jackals

 * Jak
 * Yeg
 * Bok

Hunters

 * Igido Nosa Hurru
 * Ogada Nosa Fasu

Other Characters

 * 343 Guilty Spark
 * 2401 Penitent Tangent
 * The Gravemind