Best Long Alternate Universe (AU) Fanfics
Alternate Universe (AU) fanfics from 50k to 100k words — full novel length with room for slow development. Curated from AO3, ranked by kudos.
Top 20 Long Alternate Universe (AU) Fanfics
Ranked by AO3 kudos. Each fic is tagged with alternate universe (au) and falls in the 50,000–100,000 words range.
Full circle
by tetsurashian
(aka 'how to survive endless rebirth with your so-called soulmate')Harry and Tom’s souls are tied together. Which is why they’re in this endless loop of rebirth. At some point, they stopped caring and just started fucking with people.(cracky humor with a hint of seriousness and plot, my specialty)
I Would Bring You the Stars and the Moon
by GutterWitch
“Houston, do you copy?”Caitlyn panicked, feeling extraordinarily unprepared having been thrust into her new position without so much as even a handbook to consult. What were the formalities? What was she supposed to respond with? Where was the damn push to talk button…“Hellooo? I said Houston, do yo
Whispers in Corners
by esama
Everything started with a stumble - his new life in a new world as well as his surprisingly successful career as a medium.
bones in the ocean
by bunflower
“The Angel of Death, the ferryman of the Styx, the terror of the western seas. One of the most feared captains ever to sail, and yet, I have to wonder… how did a man like you end up all on his own? We searched the area where you were found—not another soul in sight. So,” He fixes him with a long loo
Care and Custody
by esama
Eggsy takes out the medal in slightly worse circumstances, asking for a miracle.
Dearly Despised, (I love you)
by snacc_noir
Marinette could go on about why she hated Adrien Agreste—from his unfunny pranks to his ineffable attractiveness—ever since he had the audacity that day with the umbrella.And yet, here she was fake-dating him while in love with a superhero. (The adrienette enemy x fake-dating au, with fanart)
How (thanks to Gabriel) Dean and Castiel (accidentally) raised each other (and Sam).
by Vee (Vera_DragonMuse)
In which, Gabriel meddles with the time line and Castiel becomes Dean's angel rather sooner than intended.
There's Monsters at Home
by calrissian18
“How did you get past the wards?” Derek had put them up, with Peter’s grudging assistance, after the Alpha pack had made themselves at home a few times too many.The guy pulled a face. “You mean the wards a five-year-old girl with the mental ability of a goldfish could deconstruct?” He blinked wid
You're Not A Horse, Harry!
by Maeglin_Yedi
“So you’re my dad,” Harry said to the large, blond one. The one with the hammer. Supposedly a god, even. “Yes, I have conceived you myself!” His ‘father’ said with a huge, beaming smile. “With your brother,” Harry said very slowly, very carefully. “Who is apparently my mother.” Harry gave t
Pi's Lullaby
by t_pock
Hannibal smells her first. Nearly buried beneath the pungency of the cheap colognes mounted on a nearby display case is something totally incongruous: the sticky-sweet dough scent of the cinnamon pretzels sold down on the mall’s first level. He parts the suits with both hands, hangers squeaking on t
Child King
by ShanaStoryteller
Stiles is born with red eyes.
centripetal force
by braveten
Victor speaks seven languages.(Physics isn't one of them.)Luckily, though, he ends up rooming with his antithesis: a shy, black-haired boy who just so happens to be a physics major. chineserussianportuguesespanish
But is it wrong if I see him this weekend?
by ihave_a_boringlife
That thought settles into his brain dangerously. Ilya’s been with everyone. Girls. Guys. Others. What's another person on the list? If Shane wants experience… If he wants to stop feeling behind… Why not Ilya? Yes, he was a complete asshole that Shane wished he could choke to death sometimes and his
Your Name Is Tattooed On My Heart
by mcpofife
Louis is ready to find the love of his life, but first he has to stop falling for the punk rocker next door.Inspired by this tweet:
The Trouble with Threesomes and Supernatural Soul Mates
by Akira_of_the_Twilight
Peter looked at Stiles from the corner of his blue eyes and smirked. Stiles swore he saw a flash of red Peter’s eyes, but it might of have been his brain’s lack of oxygen making him hallucinate. “I’m looking for my soul mate. Christopher Argent. I believe he volunteered to be taken in for questionin
Flightless Bird
by audreyhheart
AU where Louis Tomlinson is a principal dancer with The Royal Ballet. When his rival from ballet school, moody dance prodigy Harry Styles joins the company, old wounds are reopened and old passions reignited. During the company's production of Swan Lake the secret that doomed their love is finally r
butterfly in the subway
by bigspoonnoya
Sugawara Koushi has no idea he's already in love with the man he's supposed to hate.
Loud and Clear
by oscatmeowstri
NORRIS: Are you *eating*?PIASTRI: Am I-? Of course not.NORRIS: Is it good?PIASTRI: Focus, Lando. No other cars around. Leclerc ten seconds behind, slow lap. After Leclerc is Tsunoda, timed lap, Turn 13.Let’s do a quick one.NORRIS: On it. Bon appetit, Piastri. [static, a gasp] Pastry!Or, Oscar is Lan
a locket of self desire
by lightning_anon
Tommy has fucked up. Look he knows he has. He pushed people away, took his brother's meds, and caused his other brother to have a meltdown. He's done some bad things. But that's in the past and he's doing better. He's made his amends and worked on his self worth. Just because he's fucked up in the p
I Fear No Fate (For You Are My Fate, My Sweet)
by vixleonard
Myrcella Baratheon always knew she would be married to a man for a political alliance. What she did not know was that she was going to be left in the North at 8-years-old to one day become the wife of Robb Stark and just how much it would change her life.
More Long Alternate Universe (AU) Fics on AO3
AO3's search bar accepts custom word-count ranges. We've pre-filled the 50,000–100,000 words range for you. Then read offline with Fanfict Reader.
About Alternate Universe (AU)
Stories set in a different universe or setting than canon, from coffee shops to space operas.
Infinite creative possibilities - seeing beloved characters in entirely new contexts.
Common scenarios: Coffee shop AU, college AU, royalty AU, no powers AU, historical AU.
About This List
This list of 20long Alternate Universe (AU) fanfics spans 1,448,981 total words. Kudos range from 8,351 on the newest entries to 51,422 on the most established. Nearly all (85%) are complete, so you can start any of them without WIP anxiety. The most common rating is Explicit (9 of 20 fics).
Recurring tags across this list: Alternate Universe · Kid Fic · Alternate Universe - College/University · Humor.
Read long alternate universe (au) fanfiction on the go
Fanfict Reader is the best way to browse, search, and read AO3 fanfiction on your iPhone. Download for free and start reading your favorite stories today.