The Cast

Note: Any character as themselves won’t have an “as themself” in front of them. The only exceptions are Pinkie Pie and Fluttershy, as they’re quite important later on in the story.

Main Characters

MCPON Rainbow Dash-117 as Master Chief Petty Officer of the Navy John-117
Captain Rarity Keyes as Captain Jacob Keyes
Sergeant Major Applejack Johnson as Sgt. Major AJ Johnson
AI Princess Luna as Smart AI Cortana
Private Derpy Whooves as Private Chips Dubbo
Vinyl Scratch as Crewman Sam Marcus
Octavia as Crewman Thom Shephard
Warrant Officer Pinkie Pie as... herself...
Staff Sergeant Twilight Sparkle as Staff Sergeant Marcus Stacker
Corporal Fluttershy (she’s a medic) as herself

Non-Major ENSC characters (Voices are colored)

Any type of crewman (Or should I say, Crewpony) has a light grey voice
Any type of marine (excluding some more important ones a bit lower on this section of the list) has a lime green or olive voice
Corporal Lyra Heartstrings as Private Wallace A. Jenkins (What? I choose the ranks for the ponies.)
Corporal BonBon as Private Manuel Mendoza
Warrant Officer Lightning Dust
Staff Sergeant (The Great and Powerful) Trixie
ONI Operative Fleur De Lis
Doctor/Major Whooves

Covenant

Unggoy (Grunts) ranks

Grunt Minors
Grunt Majors
Special Operation Grunts
Thirsty Grunt

Sangheili (Elites) Ranks

Elite Minors
Veteran Elites/Elite Majors
Elite Ultra Majors
Elite Generals
Elite Zealots

Other Covenant

Jackals (colored for their shields)
Hunters (colored orange for their blood, I don't know if the worms themselves are orange)

Flood

Infection forms
Combat forms (zombies)
Carrier forms

Forerunners

343 Guilty Spark

Author's Note

Note: For the best read, I’d recommend using solarized light, and gill sans.

This is Halo. This is Installation 04. This... is HALO - FOURTH RING....