Halo Crossovers
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From Domination to Genocide V2 by InnocentBlaze686 reviews
4000 years before Darth Vader, there was Mandalore the Preserver, who mysteriously disappeared from the galaxy. With the death of Chancellor Palpatine during his attempted kidnapping, the Republic seeks a new advantage over the CIS, which comes in the form of the newly found Mandalore. But something draws the Jedi away from the Republic: the screams of those suffering genocide.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 13 - Words: 52,656 - Reviews: 351 - Favs: 438 - Follows: 546 - Updated: 3/1 - Published: 1/23/2016
Semper Vigiles by Cypher1597 reviews
Headhunter, a program propagated by the Office of Naval Intelligence. After a final act of defiance against the Covenant, a Headhunter must find his place in a city ruled by corporate greed, bloodthirsty mercenaries, and roaming bands of vicious scavengers. It is the perfect hunting ground for one of ONI's most accomplished killers. Semper Vigiles - Always Vigilant.
Crossover - Halo & Cyberpunk 2077 - Rated: M - English - Adventure - Chapters: 56 - Words: 391,607 - Reviews: 670 - Favs: 750 - Follows: 889 - Updated: 2/28 - Published: 12/20/2020 - OC, V, Panam P.
The Tale of The Spacefarers: Under Azur Skies by TaleBearer42Day
When the Spartan team known as the Spacefarers (along with their crew of The Bulwark) are pulled from Reach into a world not their own, they must try to return. All while loving ship-girls and fighting Sirens, of course. Things are sure to be fun!
Crossover - Halo & Azur Lane/碧蓝航线 - Rated: K+ - English - Romance/Sci-Fi - Chapters: 3 - Words: 4,522 - Favs: 7 - Follows: 9 - Published: 2/28 - Kaga, Illustrious
War of the Old Ones by Ian the Mechanic reviews
In forgotten ages past, two near eldritch forces vied for the very life essence of the Galaxy. Unknown to the young races, that war is still ongoing. how can the UNSC, the Citadel Council or the Covenant hope to stand against such forces, when they are still embroiled in their own petty squabbling? How could they hope to survive the War of the Old Ones?
Crossover - Mass Effect & Halo - Rated: M - English - Sci-Fi/Horror - Chapters: 3 - Words: 8,093 - Reviews: 6 - Favs: 25 - Follows: 40 - Updated: 2/28 - Published: 2/21
Final Frontier by Richard Scepton reviews
The Abyssals. They pushed us back. They pushed us back to the limit. The Covenant. They commited genocide on us. And we will push back. Final Frontier. No matter what, we will push through. Humanity depends on us. Both humanities depend on us. Us. And we will advance without falter.
Crossover - Halo & Kantai Collection - Rated: T - English - Sci-Fi/Hurt/Comfort - Chapters: 11 - Words: 26,793 - Reviews: 14 - Favs: 49 - Follows: 75 - Updated: 2/27 - Published: 6/5/2021 - Hiei, Fubuki, Hibiki/Верный, Amatsukaze
Battle of Naboo by The Client reviews
UNSC and Trade federation battle for Naboo
Crossover - Halo & Star Wars - Rated: T - English - Sci-Fi - Chapters: 1 - Words: 311 - Reviews: 4 - Favs: 2 - Follows: 2 - Published: 2/27
Heroes UNITE! by So-Pro Warrior reviews
Commander Shepard and his team have gathered together the races of their Galaxy in an effort to defeat the Reapers. But is it enough? When the team comes across a strange woman they find out that if they are to truly defeat the Reapers once and for all. They will need all the help they can get. But not from their Universe. Multiverse Crossover! Chapters 6-22 Being Rewritten!
Crossover - Mass Effect & Halo - Rated: T - English - Adventure/Sci-Fi - Chapters: 49 - Words: 1,514,387 - Reviews: 885 - Favs: 375 - Follows: 368 - Updated: 2/27 - Published: 6/21/2013 - Master Chief/John-117, Shepard - Complete
Only In Death Does Duty End by Cypher1597 reviews
Spartans are the protectors of humanity. Headhunters are the sword of humanity. Both are required to fight for their species unto their dying breath. However, when death finally comes is that duty maintained? Does it continue as long as the mind can remember it? Regardless of the answer, a Headhunter must find a way to continue his duties. Even if he is no longer human.
Crossover - Halo & High School DxD/ハイスクールD×D - Rated: M - English - Suspense - Chapters: 18 - Words: 108,879 - Reviews: 255 - Favs: 469 - Follows: 634 - Updated: 2/26 - Published: 6/29/2021 - OC, Sirzechs L., Serafall L., Grayfia L.
Mass effect: the Jaded ones by Ray SK reviews
A UNSC Human-covenant war-era battle group led by a Punic class supercarrier is introduced to a new galaxy. One where people are xenophilic, use to times of peace and harmony, and against disrupting the Status Quo. What will an extremely aggressive xenophobic and battle-hardened human faction add to the mix? and will their addition change the future of this galaxy. (No Spartans)
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Humor - Chapters: 2 - Words: 8,237 - Reviews: 23 - Favs: 62 - Follows: 98 - Updated: 2/25 - Published: 2/6 - E. Buck, OC
Immortal Galaxies by Lighting wolf knight reviews
An escape from an overrun galaxy lands them in another galaxy? What does being the biggest fish in the water gain you in a world without heavy hitters? Rated T for violence, death, and profanity.
Crossover - Halo & Mass Effect - Rated: T - English - Romance/Adventure - Chapters: 3 - Words: 4,777 - Reviews: 8 - Favs: 62 - Follows: 97 - Updated: 2/25 - Published: 11/11/2021 - [OC, Vetra N.] T. Hood
The Canadian Commonwealth by Vassago1991 reviews
In the vast multiverse event can happen that should never happen this is the story of one such universe with an event that should have never happened.
Crossover - Halo & Mass Effect - Rated: M - English - Chapters: 1 - Words: 3,336 - Reviews: 4 - Favs: 14 - Follows: 20 - Published: 2/24
The Guiding Fire by UNSC indomitable reviews
A Commander striped of authority. The world divide and falling. Last fading light. Hope lays in Spirit and might. As those with the fire lay dying. All must stand fast in the face howling night.
Crossover - Halo & Azur Lane/碧蓝航线 - Rated: T - English - Sci-Fi/Adventure - Chapters: 8 - Words: 42,949 - Reviews: 62 - Favs: 121 - Follows: 183 - Updated: 2/24 - Published: 7/22/2020 - J. Cutter, Belfast, OC
Different Realities by Blue-Jay1009 reviews
As the Autobots and Decepticon stumble across a strange device that is of unknown origin. As one of their human friends accidentally activates the device it transports the two wagering factions and humans into a different universe where they landed on a dead planet that belongs to an advanced humanity a few years prior to the war with the covenant been over.
Crossover - Transformers/Beast Wars & Halo - Rated: T - English - Drama/Adventure - Chapters: 4 - Words: 5,453 - Reviews: 5 - Favs: 40 - Follows: 49 - Updated: 2/24 - Published: 1/4 - Bumblebee, Optimus Prime, Master Chief/John-117, Cortana
Flames of War by Lighting wolf knight reviews
Space Marines and Spartans weren't so different... Especially for war. Rated T for violence, death, and profanity. Doesn't entirely follow games. The story is either about Salamander Chapter or Space Wolves. Black Templar story to follow. The first few reviews for Salamander or Space Wolves will be set the choice. The next chapter is to start work on Friday after reviews.
Crossover - Warhammer & Halo - Rated: T - English - Romance/Adventure - Chapters: 2 - Words: 3,720 - Reviews: 2 - Favs: 8 - Follows: 12 - Updated: 2/24 - Published: 1/28 - [OC, Linda-058] Space Marines, Kelly-087
Why use Spartans when you have Tactical Dolls? by Yui Yuria reviews
The Spartans hated them, they were A.I. but competing with the Spartans. The ODST that knew about them were terrified of them, and even ONI did not really feel comfortable with them. Tactical Dolls were not normal A.I. as far as the UNSC understood it, certainly their programming had removed rampancy from UNSC A.I. but these A.I. had bodies. (Prologue has been totally rewritten)
Crossover - Halo & Girls' Frontline/少女前线 - Rated: M - English - Sci-Fi - Chapters: 4 - Words: 8,257 - Reviews: 15 - Favs: 20 - Follows: 27 - Updated: 2/24 - Published: 9/12/2021 - C. Halsey, Kalina
Halo: Down Fall Of The Gods by Reaper Eye Fuck ONI reviews
It is said that when an Era ends it usually ends with either Man almost dying or a lot of civilizations crumbling this is that story...if it was told by a Emo kid but no this story is told through "Fuck you and fuck your empire" "Run Xenos run for man marches"-Unknow soldier as he was shooting a Jaffa in the face with a shotgun.
Crossover - Stargate: SG-1 & Halo - Rated: M - English - Sci-Fi/Humor - Chapters: 9 - Words: 18,464 - Reviews: 38 - Favs: 62 - Follows: 80 - Updated: 2/24 - Published: 12/19/2021 - Ra, Thor, Master Chief/John-117, A. J. Johnson
Machines and Might by Strategic.Ignorance reviews
Eight years before the USJ Incident, the Hero Public Safety Commission learns of the Meta Liberation Army. Doubting the current heroes ability to stop this threat, the Commission sees this as the perfect opportunity to usher in a new age of heroes. The first step is the kidnapping of one hundred kids. Among them is Izuku Midoriya. Moderate AU.
Crossover - Halo & My Hero Academia/僕のヒーローアカデミア - Rated: T - English - Sci-Fi/Friendship - Chapters: 13 - Words: 38,931 - Reviews: 62 - Favs: 151 - Follows: 223 - Updated: 2/24 - Published: 12/1/2021 - William-043, Izuku M., Hitoshi S., Mei H.
Were it So Easy by Sigma0327 reviews
Six's life was a giant war. Every battle was a test of sheer tenacity and stubbornness against insurmountable odds. Every moment, every bullet fired, every Covenant, Insurrectionist, and Flood spore killed has led up to his last fight. Once again he was one of the few that stood between Earth and her enemies. This would be his final battle, and nothing could change that, right?
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 5 - Words: 45,863 - Reviews: 73 - Favs: 439 - Follows: 652 - Updated: 2/23 - Published: 11/9/2020 - SPARTAN-B312/Noble Six, Tali'Zorah, Miranda L., Shepard
The Lone Wolf by Lighting wolf knight reviews
He had met one who completed him and yet? She was a rabbit and he a wolf against a galaxy ruled by animals. Kelly x Space Marine. Worked on weekly. Rated T for death, profanity, and combat. Does NOT follow Warhammer or Halo Lore. Poll for White Scar or Iron Fist story set.
Crossover - Warhammer & Halo - Rated: T - English - Adventure/Sci-Fi - Chapters: 3 - Words: 5,164 - Reviews: 6 - Favs: 10 - Follows: 14 - Updated: 2/23 - Published: 1/31 - [Space Marines, Kelly-087] Orks, Atriox
The Way by Twisted Fate MK 2 reviews
Ever since the fall of the Covenant, the Arbiter has sought one thing. A path to redeem himself of his past sins. Waking up on a strange world does nothing to change that goal. Though it does add some complications to it, in the form of the bestial Grimm and strange children. But if the gods wish him here, then he shall see their desires through.
Crossover - Halo & RWBY - Rated: T - English - Adventure/Mystery - Chapters: 43 - Words: 190,601 - Reviews: 633 - Favs: 884 - Follows: 1,142 - Updated: 2/23 - Published: 12/27/2019 - Master Chief/John-117, Arbiter, Ruby R., Weiss S.
El anillo conoce al martillo by Whynotman 234 reviews
La humanidad, la especie que debió de enfrentar a una amenaza compuesta por múltiples especies unidas por una religión, enfrentando a la muerte de frente y luchando una y otra vez contra la aniquilación. Pero esta vez no será como siempre, un extraño recién llegado llego a la mesa, mas retrograda y terrible que la alianza. La humanidad se enfrentara a si misma en una forma extraña.
Crossover - Warhammer & Halo - Rated: T - Spanish - Adventure/Sci-Fi - Chapters: 6 - Words: 9,857 - Reviews: 14 - Favs: 16 - Follows: 16 - Updated: 2/22 - Published: 1/9
Halo: Avengers by IX404 reviews
For three years, everyone had assumed that the Master Chief was MIA. Little did they know was that he would not only return home, but become involved in a mission that would save another universe from destruction.
Crossover - Halo & Marvel's Avengers - Rated: T - English - Sci-Fi/Adventure - Chapters: 10 - Words: 57,570 - Reviews: 77 - Favs: 205 - Follows: 239 - Updated: 2/22 - Published: 1/7 - Master Chief/John-117, Cortana, Kamala K., Tony S.
On the Illusion of Might by evevee reviews
We thought ourselves powerful, able to conquer a galaxy with nothing but toys. When we overcame every challenge, breached the space between the galaxies themselves, what use were the words of a race ashamed of their own past? Yet we cannot deny that we were warned, for while a challenge to a human is laughable, a challenge to humanity is a death sentence.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 26 - Words: 287,962 - Reviews: 1935 - Favs: 3,415 - Follows: 4,347 - Updated: 2/21 - Published: 2/21/2017 - Master Chief/John-117, Cortana, Garrus V., Shepard
Rising of the Shield Helljumper by Autistic-Grizzly reviews
After the sacred duel between the spear and shield heroes, an army of a different world appear, one that supports the Shield Hero, now with the might of the UNSC behind him ODST Lance Corporal Naofumi Iwatani will be better equipped to handle the waves and find out the secrets linked between this world and the forerunners - rated T for now -
Crossover - Halo & Rising of the Shield Hero/盾の勇者の成り上がり - Rated: T - English - Sci-Fi/Adventure - Chapters: 7 - Words: 18,978 - Reviews: 42 - Favs: 100 - Follows: 136 - Updated: 2/21 - Published: 1/2 - Master Chief/John-117, E. Buck, Naofumi I., Raphtalia
spartan returns home by phoenix emperor 23 reviews
injured on a mission the first son of minato and kushina. he found something that put him in a war he never thought was possible. on his final mission on reach he chose to be behind. with the wider of the UNSC and ONI thought he died on reach. he had a chance to go back. now he must defended his family and the woman he love from the shadows. even it means the world to think he dead
Crossover - Halo & Naruto - Rated: M - English - Romance - Chapters: 3 - Words: 10,087 - Reviews: 2 - Favs: 30 - Follows: 50 - Updated: 2/20 - Published: 11/1/2021 - [SPARTAN-B312/Noble Six, Hana I.] [Minato N., Kushina U.]
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