Characters

Spartans

 * Master Chief - John 117

Artificial Intelligence

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

UNSC Navy

 * Lord Hood
 * Vice Admiral Danforth Whitcomb
 * Captain Jacob Keyes
 * Commander Miranda Keyes
 * Captain Carol "Foehammer" Rawley
 * Chief Petty Officer Mendez
 * Tech Officer Sam Marcus

UNSC Marines

 * Sergeant Major Avery J. Johnson
 * Staff Sergeant Marvin Mobuto
 * Sergeant Banks
 * Sergeant Stacker
 * Corporal Perez
 * Private First Class Wallace A. Jenkins
 * Private Chipps Dubbo
 * Private Manuel Mendoza

ONI

 * Colonel James Ackerson

Civilians

 * Dr. Catherine Halsey

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