The X-Men fandom is absolutely a goldmine for amazing aus, and space aus are some of the best on offer! There are so many great ones that I have to split this into 2 parts, Anon - hope you enjoy:
SPACE AUS - PART 1
Space Jam by Pangea (series)
Prince Charles Xavier is Deputy Commander of the TEF Heartsteel and the newest mission they've been assigned starts out less than desirable and quickly goes downhill from there. It's alright, though, he'll cope.
It doesn't help, though, that he's in unrequited love with his best friend and Commander of the Heartsteel, War-Prince Erik Lehnsherr.
The stars incline us, they do not bind us by ikeracity, Pangea
Intergalactic Federation pilot Lieutenant Charles Xavier is assigned last-minute to a high profile mission: transporting over two thousand prison inmates from an old and overfilled prison complex to a newer, higher-capacity prison stronghold located on the outer reaches of the galaxy. Just as he's settling down for a long and uneventful ride, things take a turn for the worse after the inmates riot and stage a hostile takeover of the ship, leaving Charles to find himself at the complete mercy of cold-blooded killers and facing the chilling prospect that he might not ever make it back home alive.
A Curious Carriage of Crystal and Cold by Etharei
Charles, a miner from a poor village in the countryside, saves the life of Erik Lehnsherr, scion of a successful business family and the richest man on the planet Eisen. Charles is a telepath and somewhat anxious about it, while Erik abstains from relationships because the lights flicker and doors open and electronics vibrate when he gets too excited.
Also featuring a long-suffering sister, a foul-mouthed bodyguard, and a best friend with a heart that is definitely not gold.
In which there are princes, spaceships, long journeys, and old secrets uncovered. (An AU sci-fi fairytale)
The Trouble with Telepaths by endingthemes
“Are you shy about me meeting your family?” Erik asks with a huge smile. “Are you kidding me?”
“It’s not funny,” Charles says, his hands firmly planted on his hips, and it’s honestly hilarious so Erik laughs right in his face.
(Or a Star Trek AU in which Captain Erik Lehnsherr pays a visit to First Officer Charles Xavier's home planet and encounters a few surprises.)
To Rattle the Stars by GQD, Pangea
All his life Charles has chafed at the bonds of gravity that hold him bound to tiny and backwater Montressor, more at home in the sky on his solar surfer than on the ground, where he's stuck working at his stepfather's inn. His heart and soul yearn for the stars, and it's his dream to one day be a spacer and sail across the cosmos on adventure.
The opportunity comes sooner than he ever imagined one night when a ship crash-lands on the inn's front doorstep, carrying a dying pirate with a mysterious map and a dire warning: beware the cyborg.
[A Disney's Treasure Planet AU]
From Rim Space With Love by manic_intent
"Captain Logan! Captain Logan!"
The skinny cadet skitters to a halt next to Logan in the rec room, red-faced and a little out of breath. Logan eyes him with a faint frown, sunk deep into a stimm couch, thumbing up the rim of his captain's hat. He's just come off a torturous fifteen-hour shift, and healing factor or not, Logan's starting to feel it. Warp space is hell on his nerves.
"Settle down, bub. What burned your tail... eh..." Logan concentrates briefly. "Cadet McCoy? Hey. Your blue's showing. Settle down."
McCoy takes in several deep breaths, and the blue fur starting to thread out of his skin sinks back in. "Sir, yes sir. Message from X-Command, sir."
Erik Lehnsherr's Guide to Saving the Universe By Meeting Your Soul-Mate and Falling in Love in Less than 72 Hours by madneto, Pangea
Army Pilot Erik Lehnsherr is just trying to enjoy his day off when a mostly naked person crashes through the roof of his car. Even more alarming, the strange falling naked person—who goes by Charles Xavier when he's not speaking an ancient dead language—brings tidings of the apparent potential end of the world, and begs Erik to help him put a stop to it.
Well. His mother has been nagging at him to go out and meet new people.
Programming by TurtleTotem
Erik is not programmed to feel affection. There's no logical reason for Charles's death to affect him like this. ((Inspired by certain elements of Prometheus, but not a direct crossover.))
Fallen from the Stars by madmalina
Erik’s only purpose in life is to find and kill the man who had his parents executed—Sebastian Shaw, Captain of the Emperor’s fleet. When Erik gets assigned to a job under Shaw’s command—on the spaceship supposed to take the Crown Prince across the galaxy—he’s sure he’s closer to fulfilling his destiny than he has ever been before.
Charles is apprehensively awaiting the day of his twenty-fifth birthday, when he’ll be crowned Emperor, because not only does he have high doubts about his own suitability for the job, he fears the crushing responsibilities it will bring, and ultimately wants nothing more than to live a quiet and peaceful life.
However, the trip across the planets of Charles’ future Empire turns out differently than they both expected, shedding light on intrigues reaching back decades into the past, and forcing both men to put their lives into each other’s hands, even though their differences are seemingly infinite.
To Catch a Thief by lachatblanche
Charles Xavier, heir to the Xavier Corp billlions, is a wealthy, carefree socialite by day, and a skilled and renowned catburglar by night.
It was, he supposes, inevitable that someday someone would find this out.
fly me to the moon (To Catch a Thief Remix) by ikeracity
Charles is a wealthy noble who moonlights as notorious intergalactic art thief X in his spare time. Erik is the bounty hunter hot on his tail (who also happens to have a massive crush on him). A fateful encounter on the luxury resort moon Prioria changes things between them forever.
Stardust by JackyJango
When Charles Xavier, Erik's long-suffering-total opposite- best friend gets dumped by his boyfriend, Erik makes a pact with him, that he'll marry Charles if he's still single even after a decade.
I, Charles Francis Xavier, agree to marry Erik Magnus Lehnsherr if I'm not otherwise married or in a committed relationship as of ten years from today, star-dated- 2020:08:007
Nearly a decade later, Erik will do anything to see Charles with a man who's worthy of him.
Some Forgotten Corner of the Universe by Black_Betty
Erik remembers the boy he met on Osiris.
Charles is no longer that boy, but that doesn't mean Erik loves him any less...
Ghost in the Shell by MonstrousRegiment
Out in the black of space, where the only creatures whose company you can always count on are violence and death, making a living is a wager. Erik’s crew of mismatched social misfits scrapes by, toeing the line between law and crime. Normally, they prefer to stay out of the Alliance’s way, but when it comes to defending the very freedom they fought for a decade ago, they only follow one principle: when someone tries to kill you, you kill them right back.
The Persistent Traveller by candycandy (telltail_heart)
Erik is the Chief of Engineering aboard the starship Poseidon, where he’s spent the last 10 years of his life dedicated to his job above all other desires. That is until he receives his newest crew member, Lieutenant Commander Charles Xavier, who proves to be more persistent than a black hole at getting what he wants, which to Erik’s utter confusion appears to be him...
May or may not be because Mod Karissa has also watched the season 2 Voltron trailer recently plus the Steven Universe leaks shhhhh
Me, an avid amateur astronomer (say that five times fast), has noticed that a star has been slowly moving across the sky the past few months and oh shit it’s not there anymore where *cue a ship crash*
I love space so much but you can never see it where I am because the nearby city lights are too bright and you drive/fly us somewhere where I can see them in all their glory I could just kiss you right now wait-
I NEVER shut up about space and you like to stay right here on earth and explore that, thank you very much
My life dream has been to see the Northern/Southern lights and after a nasty accident where I had a brush with death you help me go see them
us fighting an alien invasion
we ARE the alien invasion wow this species is resilient
I’m the new intern at NASA who’s gawking at everything and you are really amused because you were the same way two years ago
we bought glow in the dark star stickers for my bedroom but now I insist that we buy a star map to put them up there accurately
I, an astronomy major, and you, an engineering major, are working together to design a new type of spaceship in our freetime
and it ends up working but oh shit we’re lost in space
aliens invading but an alien soldier is wounded and I know it’s stupid but I can’t let someone die dammit my conscience is gonna get me killed and I know it
we stumble upon the fact that we weren’t natives to this planet; we invaded a long long time ago
More alien x human AUs?? Please pls :D they're great for otp fics
i love doing these!
(you probably already know this but i already did some over here !! )
(also if any of you use these prompt and write something, please tag me in it! i’d love to read/reblog it!)
“ok but what does this do?”“listen, this is really cute how you’re asking me all these questions but jfc stop i need to do some work.”“… what’s that?”“FOR GOD’S SAKE-”
“i know how you don’t need to sleep and everything, but please if we’re gonna share a bed can you at least pretend to sleep?”
“okay just because i’m from a different planet doesn’t mean i don’t know how to blend in.”“you just tried to dry your hair using the toaster”
“why haven’t you updated your status?”“because i don’t know how to explain to my friends that i’m dating a celestial being.”“…couldn’t you at least say it’s complicated?”
you’re the new exchange student and when i asked what country you were from you told me this country i had never heard before. so i looked it up. turns out that’s a codeword they use in area 51… o k
i taught you human swear words and you use them in really inappropriate situations… did you really have to say that at the funeral??
you told me that you had three hearts and i didn’t believe you so you told me to listen to your heartbeat. oh my god you really do have three hearts?? and why is your heart suddenly beating faster
i asked what you wanted to eat for dinner and to put it on the shopping list. ok i know you have ‘weird’ tastes but i don’t think i can buy an entire pig’s intestine without looking insane, where do you even find it?
to try and make you look less alien i had to make a disguise. it’s so cute how you looked so happy when you saw your new look, this is the purest thing i’ve seen all day
i had to give refuge to this runaway alien, unbeknown to the alien i’ve been paid to befriend the alien and feedback to the government about your behaviour. but holy shit, i need this money so bad but you’re honestly the sweetest person i’ve ever met and you’re not even a person
(alternatively) so the only reason i’m helping you is because i’m an undercover scientist who’s recording your actions and i’m meant to sedate you in your sleep (horrible i know) so that i could dissect you and examine your insides (it’s part of the job ok roll with it) . but now i’ve gotten to know you you’re actually the nicest person i know SO we’re running away where the rest of the scientists can never find us! c’mon it’ll be fun!! … i was hoping you’d focus on the positives
“there’s difference between making an impression and flat out telling someone that you’re not from this planet”“i think they like me though!!”“ok that is true, i think they’re into you”
you came round to my house with no warning and i thought you were a friend of mine, who knew i’m an alien, yeah i didn’t have my human skin on and you’re not my friend. i can explain!
“oh isn’t it your (insert length of time here) anniversary with Person B today?”“yeah yeah it is… we’re having dinner tonight, it’ll be great!”“you znark you haven’t told them yet have you?”
you told me you had a secret and i was made a joke that you were an alien and holy shit i was right for once
dude!! that is a cool alien costume! damn you’ve even got one of those realistic alien guns! that’s sick!
(additionally) that’s a real probe isn’t it
“you’re the cutest alien i’ve ever met” Person A laughed.“you’re the cutest human i’ve ever met” Person B replied.Taking a long sip of their coffee, Person C looked over at the couple. “It’s funny because you both know you’ve both never met a human or an alien before, yet you didn’t want to ruin the moment.”“You just ruined the moment why did you say that, Person C why?”
“aren’t aliens meant to eat people’s brains out?”“no you’re thinking of trillaxes. they’re dickheads, one of them killed my cousin.”“oh… i’m so sorry.”“my cousin was a dick too.”
“next time do you think you can refrain from explaining what the term; ‘verrecting’ is around kids.”“they liked it, i think so anyway! they found it disturbing!”“wrong word.”“no i know what that means. it was used in the right context.”“*sigh*”
When a mysterious object appears on the moon, Moira MacTaggert calls in two experts with very specific mutations to investigate.
Unfortunately for everyone involved, after years of breaking up and getting back together again, those two experts have finally broken up for good—and they’re the last people in the world who should be stuck together on a spaceship.
burn the land and boil the sea by kaydeefalls (series)
In which the Unification War begins, Erik leads the Browncoats' mutant faction, and Charles searches for something worth fighting for. (Fusion with the Firefly 'verse)
Remind me what you're looking for by pearl_o
"There's a dozen ships here you could get transport on," Erik points out.
"I'm asking you," Charles says.
A Beginner's Guide to Star-Forming Event Horizons by midrashic
Charles Xavier is not thrilled to be on the USSAS Magneto, with its missions to the back-end of nowhere and its captain who is famous for having violated the Prime Directive. But appearances can be deceiving.
And we pulled each other like gravity by hllfire
Erik accompanies Charles, Crown Prince of the Xavier Empire, to his first diplomatic meeting on the planet Themis, where he finds out something about the Prince and they end up talking about the past and how their paths had crossed before.
The Sleeping Beauty in the Ivory Tower (- or Erik Lehnsherr is a hopeless romantic) by ximeria
There is a tale, out among the stars, of a sleeping beauty in an ivory tower.
Infinite Distance by lachatblanche
When they encounter an unfamiliar and seemingly-abandoned ship in the middle of nowhere in space, Captain Charles Xavier of the spaceship Graymalkin heads out to investigate.
Infinite Distance (Finite Time Remix) by SlightWeasel
A month ago, far-flung Genosha went dark on every communications channel.
Whatever happened there, it has little enough relevance for young Charles Xavier, resident of Graymalkin-- until the day he receives a distress call from Erik Lehnsherr, Genosha's only surviving citizen...
Pit stop by diner_drama
Charles was pretty happy with his lot, on the whole. As chief engineer, he spent the majority of his time teaching hot-shot new mechanics and aspiring ship-builders. He could confidently say that he had created an excellent work environment that really allowed these young workers to flourish and grow. The only real challenges, apart from the occasional Very Large Fire (bad) and having to fill in his yearly expense reports (catastrophic), were arrogant pilots who believed that the importance of their ship gave them carte blanche to treat the repair crew like garbage.
Case in point, Erik Fucking Lehnsherr.
Yes, he was the best racing pilot in the galaxy. Yes, he had designed his ship personally and it was fundamentally perfect in every important way. Yes, his steely blue eyes made Charles feel light-headed whenever they came up on his viewscreen.
He was still an asshole.
Neither Rhyme Nor Reason by unveiled
Charles liked to tell people that the first time they met, Serik punched a kitten. (Or, the one where Erik is an angry Vulcan, Charles is still a telepath, and grief still shapes their lives.)
A Vision of Peace by Gerec
They call his people 'monsters' and say that a telepath is incapable of something as universal as falling in love.
But they're wrong about Charles Xavier, heir to the throne of Cerellia; for everything he does in life, he does for love.
It's Magic! (A Gift Remix) by Gerec
The Oracle agrees to help Erik locate Shaw, if Erik agrees to return to him after the mission.
And now that the deed is done, it's time to keep his promise.
Flirting with Death (Eternal Remix) by Gerec
Erik Lehnsherr is the latest in a long line of vampire hunters, their legacy going back a thousand years to the days before space travel and the existence of life beyond Earth. He's tracking one of the most dangerous blood-drinkers they've ever known, and he's determined to save the man she's targeted as her next victim.
Now if he could only convince Xavier that his life is in very real danger...
Occupation: commonly known as a 'Shader', a very in-demand Assassin/Spy/Mercenary/Bodyguard from the planet Safiyin
Planet: Safiyin. Safiyin is a river planet. Historically it was home to warrior-poet-martial-artists and fishing alcoves. Years ago the empire colonised Safiyin (very quickly) (no one had guns or star ships), and the rivers are now highly toxic because it's being used as a dumping ground for retired warships. All the fish died and the inhabitants must rely on food rations from the empire in exchange for labour. The main trades on Safiyin are ship-breaking (taking apart warships for scraps), industrial labour, prostitution and informing on your neighbours. A rare few are still taken as children, chosen to become 'Shaders' in the foothills of the mountains. Shaders were historically a special warrior class that used to keep order on the planet. The practice is dying out at the same rate that the teachers die out. Very few, once they've completed this training, stay to fulfill their peacekeeper obligations now that the galaxy has opened up for the younger generation.
Notes: Pneuma is covered in chemical burns from wading in the water, an indicator that he was born on Safiyin and his Shader training was legitimate.
*Rifat*
Occupation: Dictator. Took part in a coup against his home planet's royal family. Got voted in as leader. Quickly became tyrannical but under very reasonable policies. Anti class anti religion pro progress. Aggressively expanding his borders. Wants his power to be legitimised in the eyes of the galactic senate/trade federation (also kinda corrupt) but they rescind his application every time.
Planet: Ruruk. Formerly part of Belarilia's commonwealth (@petitsdieu). Rich in mineral resources. You can put your shovel in the soil and find sapphires big as your eye and every trace metal you need to build a reactor. To say nothing of the pearl harvesting and the jewelry artisans. However, under Rifat's reign he has repurposed the smiths into shipyards. Everything went from Art Nouveau to Brutalist very quickly. Very interested in technology and exploration.
People: The Rurik. Many were kept iliterate by the royals and mostly worked in crafts and trades. Human, but due to regional variations their natural eye colour is black.
Notes: Currently at war with the Knight dynasty, a religious order headed by Mackenzie Knight (@vitalphenomena)
I honestly don’t know if anyone has touched upon this subject for humans are space orcs, but I’m taking a crack at it anyway.
What if we’re the only species that have multiple names? In all the ‘humans are weird prompts’ I’ve seen that the aliens all seem to have one name that are different. However, we humans have multiple, and we sometimes share the same name.
Human: Welcome Captain Ethin. I am Alex and these are my friends Drew, Sara, and Alex.
Ethin: Human Alex, isn’t your name, um, Alex?
Alex: It is, but some humans share names.
Ethin: Then how do you tell each other apart?
Alex: We have multiple names. For an example, my name is Alex Green.
Other Alex: Or we have longer names and nicknames, which are shortened names, for our longer names. For an example, my name is Alexander Smith.
Ethin: Ah, I see... How many names can you have?
Alex: Most people have two or three. Some have had more than that.
“I always wish to be abducted by aliens but I didn’t think that a cosmic being came down here as a human and decided to wed me. Wait, you only wanted to wed me because I agreed to?? I SAID ABDUCTED NOT MARRY AWAY.”
“I am a creature who builds galaxies and stars for years upon years. Then you another creature came by and start building your planets, may we create a universe together?”
“Long ago I was a human but I lost my memories centuries ago. You stumbled upon me when I came down from the sky like a shooting star. Thank you for finding me?”
“I’m secretly an alien who came to this place to study the culture but yet here you are also another alien who lived here shorter than me. Stop following me, I’m not going to help you survive here!!”
“You said that you are the sky guardian. And I just called you an Alien and I’m not sure how to feel that you look like a hot human than an actual alien from the sky but you’re nuts.”
