Top 20 Epic Crossover Fanfics
Ranked by AO3 kudos. Each fic is tagged with crossover and falls in the over 100,000 words range.
snipers solve 99% of all problems
by silentwalrus
Ed had thought, after the whole Promised Day, homunculus, entire country harvested for alchemical batteries thing, the batshit quotient of his life would have settled down some. He really ought to have topped out the meter with that one. But no. The bullshit is just getting started.“Are you fucking
Edo Tensei
by Asteroid_Duck (JustThatOneGirl1815)
“The HPSC is doing what?” Present Mic asked Nedzu incredulously. Nedzu’s smile was tense. “The HPSC is concerned about the recent attack at the USJ and are choosing to intervene. A student of theirs will be transferring into Class 1-A in order to watch for a potential traitor in the school.”...Or, H
Proof That Tony Stark Has a Heart
by orphan_account
With Voldemort defeated and Harry turning seventeen, the elder Weasley boys decide to give him a chance to be a normal teenager for a while; namely, by buying him a ticket to Malibu, California. But of course, Harry Potter can never do anything normally. Especially not once he meets Tony Stark in a
Butler Spider
by Danny_shells
Just before the battle with Thanos, Dr Strange pulls together enough power to send one person to a different dimension. A chance for that person to be safe from the destruction that Thanos was about to wrought on Earth. The group about to fight agreed that Peter Parker, for sheer virtual of being th
The Long Journey Home
by HeartAway
Hail Mary Counter @hailmarytracker · 12 hrsDays since last contact with Hail Mary: 9,716🗨 1 ⇄ 2 ♡ 5 It's been nearly 27 years since the Hail Mary departed. When the ISS detects a signal in the far off solar system, hope begins to grow, even as mysteries start to unravel and the universe becomes a l
time flies by (bye)
by WHYISEVERYNAMETAKEN
"Maybe," Peter thought, "I can make a life here."Hence the tears and the guilt and the grief, because was Peter allowed to move on? Was he allowed to… to leave it all behind? Leave all the bad things in the past?Peter was "The Friendly Neighborhood Spider-Man!" after all, and wasn’t he letting Queen
he's a killer queen, sunflower, guillotine
by hoye
He has to be the weirdest Hufflepuff Harry’s ever seen.Scratch that, he’s the weirdest Hufflepuff Hogwarts has ever seen.(One thing everyone could agree on: NEVER call Edward Elric short.)
Wind Hero: Wanderer
by PhantomFox19
While travelling through Sumeru, the Wanderer has been sent to the world of Japan, to the world of Superheroes and Villains. Will he find his way back or will he use this opportunity to start new life on a clean slate? The Wanderer in My Hero Acadamia
The Ones Burnt
by This_is_lovin
“Thank you, sir.” Peter turned facing M.J. and Ned’s silhouettes that wobbled against the rising sun.“Call me Stephen,” Doctor Strange said.Peter smiled, “Thank you, Stephen.” The name felt odd coming out of his mouth.The laugh was slight, barely even one. “Still feels weird.” Stephen smiled; it was
A Dovahkiin Spreads His Wings
by VixenRose1996
When the Bastard of Winterfell, Jon Snow, disappeared nearly five ago, its said that part of Ned Stark died.When a letter arrived a Winterfell, nearly three years ago, from Jon Snow stating that he was alive and well but living in a far-off land, its said that Ned Stark was renewed with life.But whe
Thrower of the Dart
by Vathara
What might have happened instead of Artemis Fowl book 6, if it'd happened in the Marvel Universe. Megalomaniacs ahoy!
Honkai: Star Rail - Multiversal Projection
by Icedrone24
A beam of light, transcending the barriers of countless universes, projected onto the countless worlds, becoming a spectacle for the natives of each world! When Jingliu finely diced Blade into minced meat, the Demon Slayer Corps were shocked! 'What kind of breathing technique is that? Ice Breathing?
How to Overthrow a Second Government
by brynthany
The revelation of a universe jumping portal finds Team Mustang visiting the English Wizarding World at the invitation of their Ministry during a time of unrest. Roy and his team are to advise their inefficient Ministry and gather information as Edward teaches the basics of Alchemy to unappreciative
Pirate Heroes
by The_Mad_Mystic
Izuku Midoriya dies after the fight from Overhaul, successfully saving Eri. Before he passes on, something gives him an offer. A new world to explore, a goal, and friends both old and new await him. The good news, the pirates he ends up joining are good people. The bad news, they are probably as cra
Universe Falls (old)
by MiniJen
What would happen if the Crystal Gems had settled down in a place other than Beach City, a little backwoods town just west of weird…? What if, upon coming to Gravity Falls for the summer, Dipper and Mabel were to befriend Steven and Connie? What kind of magical, mysterious adventures would they have
Of Smoke and Salt
by RedHawksenFoxer
Shot out of the skies of Westeros only to wake up on the shores of Middle Earth, Rhaegal Targaryen finds himself as a prophetic keystone to end a war and begin a new age of peace.
From One Apocalypse to Another
by y_oruko
Five lost his siblings to the void of time when he recklessly tried bringing them all to travel back in time. The plan bit him in the ass and he ended up getting spat out in a zombie apocalypse. Everything just kept going downhill from there, for him and everyone else.--- ---Rick didn't know what to
The Second Archon War
by FullParagon
Kyushu, Japan. November 2nd, 1999. The day the first god decended. And the first Beast was slain.The day the war for the fate of all Earths began. The war between Gods and Beasts, Archons and Entities.May Heaven help us all.Inspired by Zakara
Universe Falls
by MiniJen
When Dipper and Mabel arrive in Gravity Falls to spend the summer with their Grunkle Stan, they aren't expecting much excitement. At least until they meet Steven Universe, his friend Connie, and the Crystal Gems. And once they come together, the kids realize they're in for a summer unlike any other.
Amy Dallon, Herald of Andraste
by Kylia
Amy Dallon. Panacea. A self-loathing, damaged, troubled young woman who's sanity teeters on the edge of a knife. In love with her sister, feeling like an alien intruder in her own family, desperate for the approval of a mother seemingly unable to give it, and overwhelmed by the monstrous potential o
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About Crossover
Two or more separate canons collide: characters from different universes meet, team up, fight, or fall in love. Crossovers range from elegant fusions that merge settings into one world to gleeful collisions that drop one cast into another's plot.
Crossovers answer fandom's eternal 'who would win' and 'would they get along' debates on the page, and the friction between universes generates stories neither canon could hold alone.
Common scenarios: Detectives from two different procedurals jurisdictionally forced onto the same case, or a fusion sorting one show's cast into another universe's institutions.
About This List
This list of 20epic Crossover fanfics spans 6,984,221 total words. Kudos range from 673 on the newest entries to 23,011 on the most established. Most entries are ongoing works, so subscribe on AO3 for update notifications. The most common rating is Teen And Up Audiences (14 of 20 fics).
Recurring tags across this list: Crossover · Alternate Universe - Canon Divergence · Action/Adventure · Humor · Not Canon Compliant.
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