Kingdom Hearts – Crossovers / Fanfic Recs

These are recommendations made by Tropers for Kingdom Hearts Crossover fics, all of which have to be signed to stay on the page. Feel free to add a fanfic of your own to the list, but remember to use the template found here.

You can also add to the current recommendations if you want. Refrain from posting Conversation in the Main Page though; that goes in the discussion page.

A Certain Magical Keyblade Wielder by KHVSFF

Recommended by Xenogaias
Crossover with: A Certain Magical Index
Status: Ongoing
Synopsis: Waking up in an unfamiliar city, Sora has no idea where he ended up. After vanishing from his world, Sora will have to find a new way home in this mysterious city. Along the way, Sora will meet new friends & foes while also facing new challenges in his life. However, Sora won't be alone as a familiar, yet misfortunate boy who will help him navigate Academy City and its secrets.

A Song of Fire, Ice, and Hearts by Jebest4781

Recommended by: Arcanum99
Crossover with: Game of Thrones
Status: Ongoing
Synopsis: Venturing outside of the Heart of his Somebody, a Nobody enters a World where it's at the brink of self destruction. Will he be able to handle and survive the Game of Thrones?
Has its own page.

Colosseum of the Heart by Ikell

Recommended by Clato Lawa
Crossover with: Pokémon: The Series and Pokémon Colosseum
Status: Ongoing
Synopsis: After sacrificing everything to save Kairi, Sora finds himself in a world of strange and powerful creatures. Enter Ash Ketchum, a young man lost in a different sense, having become Champion of Alola and faced with an uncertain future. To save a land shrouded in darkness and shadow, they and their friends must re-examine what, or who, truly drives them. Welcome to Orre.
Pairings: Sora/Kairi, Ash/Serena
Now has a trope page

Dead Hearts by Kurei Scale

Recommended by VictorioMWolff-Haddock
Crossover with: Dead Space
Status: Ongoing
Synopsis: Summoned by Master Yen Sid for their Mark of Mastery, Sora, and Kairi venture into a new reality. But what they don't realize, is that this "reality" is anything but, and is a place where Hearts are tormented in their world's fine hours.
Comment: Very engaging. Sora and Kairi were tasked by "Master Yen Sid" to venture into a new world, only to find that this new world is barren of Hearts except for Issac and possibly Ellie.

The Empty Sea by KingofZeroX

Recommended by Shadow Arisato
Crossover with: Persona 3
Status: Dead
Synopsis: Minato has lost everything, reduced to an empty being in a universe that's not his own. But he will regain everything. And he will return home. No Organization or Shadows will get in his way. But why, oh why, must he go through this Journey with this optimistic trio of an anthropomorphic dog, a magic casting duck, and an overly positive kid? Why can't life ever be simple?
Comments: This story takes place after Persona 3 and after gaining control of Sora in Kingdom Hearts II.

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Encanto Hearts by Shuckle2001

Recommended by VictorioMWolff-Haddock
Crossover with: Encanto
Status: Ongoing
Synopsis: When her world falls into darkness during the night of her youngest cousin's Gift Ceremony, the Kingdom Key of Light appears in Isabela's hand. She's now the only one who can protect all worlds from the heartless and hopefully restore her home from the darkness.
Comment: Rather than the obvious Maribel, The Kindom Key chose Isabela, and she'll have both Minnie Mouse and Oswald The Rabbit as her mentor.

Fairy's Blade Chronicles by Great-Celestical Dragon

Recommended by Dwaugh91
Crossover with: Winx Club
Status: Ongoing
Synopsis: Taren the son of Sora and Kairi is thrusted into an adventure where he will be called to save his world and the magix dimension from a mysterious new evil on the move. In his journey he will meet new friends, enemies and love whilst learning what it means to be a wielder of the Keyblade.
Set in Post-Kingdom Hearts Story and season 1 of Winx Club
Comments: Story is interesting with fun adventures and action is good, some bit of spelling and slight grammer but appears to improve over time to correct mistakes. Balanced combination of two fictional universes and character development with the OC as the main character and interaction between characters. Also interesting lores which have not been focused and blend between different worlds.
Tags: Semi-Au, Humor, Action, Adventure, multi-crossover, Harem, OC

Flowers for the Dead by Preferably Bitter 52

(Ao3 Link

)

Recommended by: VictorioMWolff-Haddock
Crossover with: Drakengard 3
Status: Ongoing
Synopsis: The chaotic world of Midgard is ruled by Intoners, sisters whose songs unleash vast powers. Riku's search for Sora has him end up in Midgard where he meets the oldest of the Intoners, Zero, and is roped up into her quest of killing her own sisters.

God of War: Chains of the Heart by LetsDoThatAgain (SpaceBattles thread

)

Recommended by eagle109
Crossover with: God of War Ragnarök
Status: Ongoing
Synopsis: Sora tried to save two of his friends, and unfortunately Did Something Wrong, sending him to Midgard. Sora, meet fellow World traveler Kratos, his boy Atreus, and head Mimir. Post-Ragnarok, Kratos has heard rumors of the Keyblade (namely the horror stories), and while distrustful at first, goes about helping Sora find his way home with help from others. As always, things never go as planned.
Comment: Sora might feel a bit too casual when interacting with the other GoW characters, even taking his near constant optimism into consideration towards a particular world's rules or when explaining, but he does still have his moments of maturity to understand why certain actions were Bad Ideas (such as being told a few times his haste to do something tends to make things worse).

Guardians of Magic by Shire Folk

Recommended by: Reterusu
Crossover with: My Little Pony: Friendship Is Magic
Status: Incomplete
Synopsis: When dark creatures begin appearing in Equestria, Princess Celestia and Princess Luna summon the bearers of the Elements of Harmony to Canterlot. Before the six ponies can arrive, though, four strange ponies are expelled from a portal that appears in the throne room, and they explain that Equestria is not the only place at risk from these creatures.
Comments: A crossover that manages to carve out a place for itself in the heap.

Heart of the Shield by Shadowslayer133

Recommended by: VictorioMWolff-Haddock
Crossover with: The Rising of the Shield Hero
Status: Dead; last updated December 15th, 2021
Synopsis: After successfully saving Kairi, Sora finds himself in a brand new world. They claim to have summoned him, saying he is the legendary shield hero. With the threat of the looming Waves of Darkness, and the judgment of people he's never even met, will he succeed in saving this world with only his shield?
Comments: Sora, being Sora, not only manages to sway Aultcray for the better, his action of saving Motoyasu ends up with the two joining forces rather than forming a party, and allowed Ren to see how biased people are against the Shield Hero despite Sora's positive personality. meanwhile, Sora's friends are looking for him, while saving slaves along the way, including Raphtalia and Keel who mistake Goofy for the Shield Hero.

Heartless by Drich

Recommended by Neo Shiraku, Robinton
Status: Complete; Sequel Dormant (as of Feb 2021)
Crossover with: Naruto, Puella Magi Madoka Magica, and Digimon so far
Synopsis: A poster on SpaceBattles.com finds themselves transposed into the body of a Shadow, and must survive long enough to return home.
- Robinton: To quote a few of the best lines from memory, "When the in-universe characters have reacted, and launched plans of their own, and the timeline's gone topsy-turvy to the point that even the SI doesn't know what's going on - that's when you know you're doing them justice." "Though the connection was brief, two Hearts beat with renewed Hope." "Quo Vadis. And the skies burned crimson." "Memories cannot be truly Erased. Not so easily." "Trollbito." "If you see Drich, listen! Follow any orders Drich gives, unless specifically directed otherwise. If Drich is here, either Drich ate the Juubi, or the Juubi is free; either way, you'd better darn well listen." "I am The Dark Partition." I'd very highly recommend. Some sections drag on a bit, but overall one of the best fanfics in existence. If Drich wanted to go into writing, I'd follow.

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Hearts and Souls Are The Same Thing Down Here by Chlstarr

Recommended by: Harukaze
Crossover with: Undertale
Status: Dormant; last updated September 2017
Synopisis:Sora and Company end up in the world of Undertale and help Frisk venture through the Underground. Of course their presence seems to make things weirder than usual as Heartless that have never been around pop up and mess with everything. Not to mention the gang has to get used to this world's version of "fighting" and try to make friends with the Monsters who inhabit the Underground.
Tags: Undertale Spoilers, Pacifist route spoilers, mild spoilers throughout, takes place during KHIII, friendship roadtrip.

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Hearts of the Boiling Isles by Dark Gold Writings

Recommended by PhantoMaster
Crossover with: The Owl House
Status:
- Season 1 - Completed
- Season 2 - Ongoing
Synopsis: In the climactic finale of Kingdom Hearts III, Sora uses the Power of Waking to set out on a deeply personal quest in search of Kairi. He embarks on a thrilling new expedition, awakening in the extraordinary realm of the Boiling Isles, where demons, magic, and witches abound. Unbeknownst to the Keyblade Wielder, Sora would forge new friendships, encounter both fresh and familiar foes, reunite with old comrades, and face daunting trials as he seeks his lost companion in the demon realm.
Comments: Despite being written in a script format and having some spelling and grammar errors, as well as a few minor plot holes, this fanfiction crossover is captivating to read. The narrative presents thrilling adventures, engaging action/fight scenes, endearing chemistry or relationships among the main protagonists and the characters, and compelling drama. What sets this fanfic crossover apart is its commitment to the original worlds' lore, skillfully blending them as the story unfolds and expanding upon them to create a unique storytelling experience. Moreover, it delves into intriguing subjects that haven't been explored across the two series and seamlessly weaves them into the plot, adding to the story's allure.

I'm Nobody (AO3 mirror

) by free man writer

(co-written with Jebest4781.)

Recommended by: Lermis
Crossover with: Mass Effect
Status: Ongoing
Synopsis: He didn't have anything when he was born. Just a name and number. But over time, what he had grew. He, with his friends began to understand that there was more to their existence then just their name and number. They will prove that they were meant to be real. To exist. To become something more than just a Nobody.
Comments: One of the rare few times that Mass Effect gets crossed over with a fantasy setting, and it's glorious. It starts very much like a typical "X character ends up in another world" setup, with Roxas mysteriously finding himself in the Citadel. However, over the course of the events the Kingdom Hearts and Mass Effect universes start blending more and more, and the cast of characters gets increasingly diverse, slowly but surely diverging from canon. It starts with the Heartless appearing in the Citadel and goes from there. It also introduces several new Disney worlds - or references - that were not included in the original games, such as The Incredibles, Treasure Planet, Lilo & Stitch, and more.
Has its own page.

The Key of the Titans by True Darkness 157

Recommended by: VictorioMWolff-Haddock
Crossover with: Teen Titans 003
Status: Ongoing
Synopsis: After nearly losing his heart to Xehanort, Sora goes off on his own to get his powers back, only to find himself becoming a member of a group of young superheroes known as the Teen Titans. What adventures will take place when the great keyblade wielder joins a group of teenage metas?

Kingdom Hearts of an Eastern Wonderland by Frost Matrix

Recommended by Naal 2
Crossover with: Touhou Project
Status: Dormant; last updated August 2017
Synopsis: Kids do their best now and are preparing. Please watch warmly until it is ready. The boundaries of light and darkness are in disarray. A hero and a miko are the ones who will open the door.

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Kingdom Hearts: Beyond The Door To Light Series by AndrewK9000

Recommended by Sailor Tardis
Crossover with: Winx Club, Naruto ,Fullmetal Alchemist (2003), My Little Pony Tales, One Piece, Sailor Moon, Hannah Montana, W.I.T.C.H., Space Battleship Yamato, Twilight, His Dark Materials, Scott Pilgrim, Ranma ½, Harry Potter and The Incredibles
Status: Complete
Synopsis:
- Kingdom Hearts: Beyond The Door To Light: Sora, Riku and Kairi face their greatest challenge yet as they journey to The Magical Dimension and must defeat an evil greater than Organization XIII, while helping two destined lovers heal a fractured romance. Who will survive?
- Beyond the Door to Light Volume2: The Shinobi Path: Sora and the gang travel to The Hidden Leaf village to stop The Heartless from plunging the world into darkness. While there, they help a certain hyperactive knucklehead of a ninja and his friends. But the forces of darkness are gathering.
- BTDTL volume3: Rise of The Keyblade Alchemist: Sora and the gang have landed in the world of Fullmetal Alchemist, where they must join forces with The Elric Brothers in order to combat The Heartless. All the while, someone from that world will be called upon to take up the fight against the darkness.
- BTDTL volume 4: Nightmares in Dream Valley: Sora and the gang arrive in Ponyland, where The Heartless are abducting The Little Ponies. The daughter of Megan and her friends have the power to fight back, so our heroes join forces, while a champion from the past steps forward to fight the darkness.
- BTDTL Vol5: Legend off the Straw Hat Crew: The Keyblade Wielders arrive in the world of One Piece and team up with Monkey D. Luffy. But this time, not only do our heroes have to deal with The Heartless and local villains, but some vengeful Hakonians and one irate Sea Witch. Who will survive?
- BTDTL Volume 6: Love and Justice in Tokyo: Sora, Riku, Kairi & Aiden arrive on a parallel Earth and meet the Sailor Senshi, as well as the second Princess of Heart. Meanwhile, the local baddies team up with another Hakonian to create a monstrous hybrid that may destroy all of our heroes.
- BTDTL Volume 7: The Tournament of Light: The Keyblade Wielders enter a grand tournament in order to help Ranma Saotome, the son of their teacher. At the same time, a lone maniac seeks to kidnap Hannah Montana, AKA Miley Stewart, who happens to be Kairi's penpal. Who will survive?
- BTDTL Vol 8: The Magic of Five: Sora and the gang to go Metamore to help The Guardians of the Veil defeat the vile Phobos and save Elyon. But the Hakonians are also on Metamore, as is an ancient evil beyond anything our heroes could have imagined. Who will survive?
- BTDTL Volume 9: The Yamato Encounter: Our heroes take their new Gummy Ship out to the worlds, but end up chasing the Hakonians to the realm of Space Battleship Yamato, while also facing the greatest threat to life in all of existence; The Daleks. Who will survive?
- BTDTL Volume 10: Of Vampires and Daemons: As Sora and the gang return to The Realms of Light, they encounter many old friends and make many new ones. But the enemy is preparing for a new assault, one that will rock the realms down to their cores. Can our heroes and a new group save the day?
- BTDTL Volume 11: Search for the Keys: Things are heading towards the endgame as Sora, Hayner and their respective teams close in on the remaining keys to unlock the Sacred Talisman of Zumakalis. But the enemy have plans of their own, culminating in the worst one Gideon has to offer yet.
- BTDTL Volume 12: The Light Within: It all comes down to this, the final part of Beyond the Door to Light. With Sora, Riku and Tess unable to use their Keyblades, it's up to their friends and allies to protect the Princesses of Heart, while Aiden has his own adventure in time and space.

Kingdom Hearts: Cody's Story by TDDolphin21

Recommended by CMR Rosa
Crossover with: Total Drama
Status:
- Kingdom Hearts: Cody's Story - Complete
- Ultima: Total Drama Ultima 2 - Dead; last updated April 23rd, 2012
"Synopsis'':
- Kingdom Hearts: Cody's Story: Cody has been chosen as the new keyblade master. He and three other Total Drama contestants travel through the Disney Worlds looking for their friends while also trying to restore their world.
- Ultima: Total Drama Ultima 2: The twenty-two campers from TDI are split up when their world is destroyed by a group of villains known as the Organization. Traveling to other universes and meeting strange characters, will they escape the Organizations wrath?
Pairing(s): Cody X Bridgette, Owen/Izzy, Tyler/Lindsay, Duncan/Courtney (however with a bit of Duncan/Gwen at the end), Geoff/Bridgette, one-sided Harold/Leshawna and mentioned one-sided Cody/Sierra.
Has a page.

Kingdom Hearts: Familia Myth by Keybladewielder97

Recommended by ultimomant
Crossover with: Is It Wrong to Try to Pick Up Girls in a Dungeon?
Status: Ongoing
Synopsis: After what Sora considers to be the most challenging fight of his life, he is expected to be teleported back to the Final World. What he didn't expect was to wake up in a world filled with Gods and a Dungeon so deep that no one knows how far it goes. Finding a way back home isn't going to be easy, but at the very least, he has the heart to fall back on; Basically, the story is about what would happen if Sora after fighting Yozora ends up teleported to Orario (Dan Machi) and meets a certain rookie adventurer and a certain household goddess.
Pairings: Sora/Kairi, Sora/Harem, Bell/Aiz, Bell/Harem
Has its own page.

Kingdom Hearts: Grand Order by KingSora3

Recommended by ultimomant
Crossover with: Fate/Grand Order
Status: Ongoing
Synopsis: You all know the events that lead up to Sora's disappearance from his and his intense battle with Yozora. But what if instead of ending up in the city Quadratum, he ended up in the fabled Clock Tower, meeting the infamous Wizard Marshal? Guided by him, Sora ends up in a world where humanity is on the brink of destruction and must save it with Chaldea's Final Master.
Pairings: Sora/Kairi, Sora/Harem, Gudao/Mash, Gudao/Harem
Has its own page.

Kingdom Hearts: My Keyblade Academia by Sora Sentry

Recommended by Corey Griffindor
Crossover with: My Hero Academia
Status: Ongoing
Pairings: Izuku Midoriya/Ochako Uraraka, Sora/Momo Yaoyorozu, Riku/Kyoka Jiro
Synopsis: "There's no such thing as a quirkless hero" That is what people kept telling to Izuku Midoriya through all of his life. He understood it, even now that he was bestowed with All Might's quirk. However he kept wondering if it was possible if not here maybe somewhere else. He was about to find out when he enters UA academy and meet two interesting boys. Life's about to change forever.
Comments: Takes place after the events of Kingdom Hearts III after Sora uses the Power of Waking to save Kairi, he is separated from his worldline and ends up in the MHA worldline with Riku deciding to use the Power of Waking as well to find Sora. A great fusion of both series while it does follow the MHA story it still has that Kingdom Hearts blend that works incredibly well. Story was published before the release of Kingdom Hearts III Re:Mind and Kingdom Hearts: Melody of Memory.

Kingdom Hearts: Path of the Keyblade Master Series by AndrewK9000

Recommended by Sailor Tardis
Crossover with: Necroscope, Winx Club, Super Sentai, Harry Potter, Monster High, Spirited Away, My Little Pony: Friendship Is Magic, Dead Island, BioShock, Sword Art Online, Sofia the First, and Adventure Time.
Status: Complete
Synopsis:
- Kingdom Hearts: Path of the Keyblade Master: The first volume in my new series. This time Sora and the gang team up with heroes from a parallel world in order to vanquish a darkness greater than The Heartless; The Wamphyri. Who will survive? (Complete)
- POTKM Volume 2: Concerning Charmix: Our heroes travel to Alfea to help the Winx battle the insidious Darkar and The Trix and save The Magical Dimension once again. Yet Darkar has his own plans, as does Xehanort. Who will survive? (Complete)
- POTKM Volume 3: Keyblade Wielders vs Super Sentai: The mystery of Tess's past is finally revealed, but an even bigger mystery comes into play. A sinister figure is after Tess and it's up to Sora and the others to save her. But they're not alone as the Abarangers, Hurricangers and Gaorangers come to help. And what of Maleficent and Xehanort? What will they do in this new crisis? (Complete)
- POTKM Volume 4: The Sign Of The Sacred Heart: Sora and the gang finally go to Hogwarts, while behind their backs, their friends in The Realms of Light plan a grand meeting. While at Hogwarts, our heroes find themselves involved in a mystery that goes back to the time of The Four Founders. A strange symbol is the center of a conspiracy that could result in the destruction of all life on the world. Who will survive? (Complete)
- POTKM Volume 5: Of Monsters and Meta Humans: Our heroes arrive on the world of Monster High and become involved in a diabolical conspiracy to steal The Necronomicon. Sora and his group team up with The Bureau, while Kairi meets and makes friends with Frankie Stein and her fellow Monsters. Both groups converge to battle an insidious cabal, but just who is the real enemy? (Complete)
- POTKM Volume 6: The Great Bathhouse Battle: Sora and the gang travel to Yubaba's Bathhouse to find Kairi, while also battling the insidious forces of Gorgom and Dai-Shocker, while Kairi has stumbled into Rapunzel and Eugene. Heroes from across time and space will be drawn into this cataclysmic conflict where the fate of existence and the life of Kairi shall be weighed in the balance. Who will survive? (Complete)
- POTKM Special Volume: Zangyack Attacks: Captain Marvelous and his crew of space pirates arrive at Radiant Garden in time to help repel a Zangyack invasion. Yet there is far more going on than simple conquest. The insidious heir to the empire seeks to capture the Princesses of Heart and if she succeeds, then all of reality will fall to darkness. Who will survive? (Complete)
- POTKM Volume 7: The Equestria Caper: Our heroes set out to recover the missing powers of The Princesses of Heart. Their first stop: Equestria, where they will uncover a dark conspiracy to bring about the end of the world. Yet who is the true mastermind of the dark cabal behind the insidious plot? And what, pray tell, is the secret of The Machine? (Complete)
- POTKM Volume 8: The Banoi Nightmare: In search of the next missing power, Sora & the gang make a brief stop at Metamore to team up with The Guardians of the Infinite Dimensions in order to save Anna and Kristoff from a zombie apocalypse. Yet our heroes and allies have more than a seemingly endless horde of walking dead to worry about. Who will survive? (Complete)
- POTKM Volume 9: Escape From Rapture: Our heroes dive deep into Andrew Ryan's underwater dystopia in search of the next missing power. Secrets will be revealed, alliances will be formed, and a new evil shall arise, one that Sora and the others will find most heartbreaking. Who will survive? (Complete)
- POTKM Volume 10: The Haunting in Aincrad: Kairi finds herself trapped in the world of Alfheim Online and must rely on the help of Kirito, Asuna and their fellow players in order to return to the real world. Meanwhile, Lady Darklight's assault on The Realms of Light relentlessly continues. Who will survive? (Complete)
- POTKM Volume 11: Sofia's War: Tess and Malcolm find themselves in Enchancia on the verge of war. It's up to our heroes in Enchancia and elsewhere to keep Sofia from losing her heart to the darkness, as well as solve plenty of problems plaguing the kingdom. Yet far more is at stake as Columbina advances her insidious plans to destroy The Realms of Light. Who will survive? (Complete)
- POTKM Vol12: The Grand Culmination: It all comes down to this as our heroes struggle to stop Katrina from carrying out her vile scheme. Tess, Aiden and Malcolm head to Ooo to link up with Riku, while Kairi desperately holds the line in The Realms. But evil lurks everywhere as The Lich in his stolen body lays his own plans. Who will survive? (Complete)

Kingdom Hearts: Saving Life in Another World by GreenWarrior291

Recommended by VictorioMWolff-Haddock
Crossover with: Re:Zero
Status: Ongoing
Synopsis: After having defeated Xehanort and managed to have saved Kairi from her fate, Sora disappears into a dark abyss of Darkness. Just as it seems like it'll be an endless sleep for having abused the Power of Waking, an outsider manages to teleport the young keyblade wielder into a different world.
Comment: Things will get better from canon for not only Subaru unlocks his own Keyblade, his parents end up appearing in the new world.

Kingdom Hearts: The Master Who Fell Through the World by Lord Maximus

Recommended by ultimomant
Crossover with: RWBY
Status: Ongoing
Synopsis: When Aqua sent Terra back to the Light Realm, Aqua didn't know what would happen when she fell into the Dark Realm. Instead, he woke up to find himself in a whole new world with a strange island with two suns and a giant tree.

Kingdom Hearts: The Nintendo Version Remixed

by KingdomKey23

Recommended by Ford1114
Crossover with: Nintendo
Status: Ongoing
Synopsis: A remake of my Nintendo Version Kingdom Hearts story. What if Sora visited Nintendo inspired locales instead of Disney ones? Well, let's find out, as he teams up with Luigi and Yoshi to find his missing friends across numerous, fantastical worlds! All the while battling mysterious, ferocious entities known as the Heartless.
Has a page.

Kingdom Hearts: Winter War by colossalblackening

Recommended by Taromaru
Crossover with: Bleach
Status: Completed
Synopsis: After using the Power of Waking to find Kairi, Sora awakens in the mysterious land of Hueco Mundo with no memories of his past life. Lost and confused, Sora joins forces with the Soul Reaper, Sōsuke Aizen and his Arrancar army. However, there is more to the truth of his lost memories than what he believes.
Pairings: Sora/Kairi, Ichigo/Orihime, Grimmjow/Neliel
Comments: It is a well-written crossover that cleverly intermingles the world-building and lore of both series.

Kingdom Shinigami by ElementalL'Cie

Recommended by ultimomant
Crossover with: Bleach
Status: Completed as of 4-9-2018
Synopsis: Dragged from his world by darkness, Toshiro Hitsugaya must figure out how to get back home by traveling with the famous Keybearer, Sora, and his cartoon companions. He goes from world to world with the trio to find his way home and finds he's not the only one who was kidnapped from his world...
Comments: Hitsugaya joins the party at the beginning of Kingdom Hearts II, and his advanced powers make most of the fights a lot easier, but the plot starts to differ from the game with the reveal that Demyx's Somebody was a former Soul Reaper, and several characters are aware of the Soul Reapers and Soul Society.

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The Light of Remnant by ImSoAwesome

Recommended by ultimomant
Crossover with: RWBY
Status: Complete
Synopsis: After experiencing a strange vision, Sora goes to a new world called Remnant to rid it of the Heartless. But when a much bigger plot rises that threatens the entirety of Remnant, Sora must team up with Ruby, Weiss, Blake and Yang to defeat an evil most potent. Set after Dream Drop Distance (KH) and after Season 1 (RWBY).

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The Lingering Heart: Forged Through Promise by Silver W. King

Recommended by: VictorioMWolff-Haddock
Crossover with: Worm
Status: Dead; last updated October 16th, 2018
Synopsis: Taylor gains a Keyblade instead of getting Parahuman power.

Nicktoons & Disney Heroes UNITE! by Dr.Dude

Recommended by ultimomant
Crossover with: Nicktoons Unite!
Status: Ongoing
Synopsis: An evil Syndicate spanning four worlds has formed in order to work for the common goal of universal domination, and it is up to four heroes from those worlds to band together and stop them. However, a slight mistake has brought them to a new world entirely, and an even bigger adventure unfolds alongside their own as they join with a boy holding a key.
Has its own page.

NieR: [O]blivion by Preferably Bitter 52

/Catch358

([[Ao3 Link

)

Recommended by VictorioMWolff-Haddock
Crossover with: Ni Er Automata
Status:
- NieR: Oblivion - Complete
- NieR: [O]blivion Ver. 1.5 - Complete
- NieR: [O]blivion II - Ongoing
Synopsis:
- NieR: Oblivion - After the events of KH3, Sora finds himself in the world of NieR: Automata. He meets A2 and decides to help her on her mission to destroy the machines, hoping she might be the answer to finding his way back home to his friends. However, when Sora gets wrapped up in the war between androids and machines, he realizes going back home might be harder than he thought.
- NieR: [O]blivion Ver. 1.5 - Collection of additional side content/storylines from the original NieR: [O]blivon story.
- NieR: [O]blivion II - The machine numbers are dwindling, YoRHa is gone and for the most part, the Earth is finally at peace. A2 should be happy with her life…but she’s not. Something is missing. When a chance opportunity comes to change her life around, she takes it and it ends up having devastating consequences for not only Earth but for all other worlds.

The Nobody of Ever After High by Cloud4012

Recommended by SuperHeroTimeFan, Sailor Tardis
Crossover with: Disney Animated Canon, Monster High, 'Hotel Transylvania, Miraculous Ladybug, Final Fantasy, Thor: Tales of Asgard, TMNT, Mary Poppins / Mary Poppins Returns, Happily N'Ever After, Storm Hawks, The Legend of Tarzan, Anastasia, etc.
Status: Ongoing
Synopsis: All Roxas wanted was to exist, once he merged with Sora he thought his journey was over. Now he is pulled into a world where the children of fairy tales can choose their destiny. Will this Nobody finally find what he is looking for and what surprises will this new life have for him? Roxas has faced many challenges, but Ever After High is nothing like anything he's ever faced.

The Open Door by Tigrin

Recommended by: Animenutcase, Ellamew, oathkeeper85
Crossover with: Silent Hill
Status: Complete
Synopsis: On the edges of light and dark, Sora and company crash-land on a bizarre new world. Sora catches a glimpse of a figure, and the search for Riku begins in the nightmare realm of Silent Hill. Guided by a mysterious dark figure speaking in riddles, Sora, Donald, and Goofy must battle their way through a horde of horrific creatures. The farther they move through Silent Hill, the further they move from reality.
Comments: Very well written, the author has a very good perspective on turning this family-friendly series into a psychological-horror thriller.

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The Pros and Cons to Living a Triple Life by Shire_Folk and Warner

Trope page here
Recommended by Clato Lawa
Crossover with: Persona
Status: Ongoing
Synopsis: Some time after recovering from the events of Kingdom Hearts III, Sora, Kairi, Riku and Naminé are sent on a long-term undercover mission to Shujin Academy, in search of the Master of Masters. This mission quickly converges with that of the Phantom Thieves.
Pairings: Akira/Ann, Sora/Kairi, Riku/Naminé
Note: Some explicit scenes between Sora/Kairi and Aqua/Terra.

Puella Magi Madoka Magica Reconnect by monkeycyborgninja

Recommended by Orion Gold
Crossover with: Puella Magi Madoka Magica
Status: Ongoing
Tags: Post-KH 2, Post-PMMM: Rebellion, PMMM: Rebellion Spoilers
Synopsis: "I've been having some weird thoughts lately... like, is any of this real, or not?" A year has passed since Madoka returned to Japan, and when she begins to question her own memories, she sets out on a journey to find the one person she believes has the answers, all with the help of a key shaped sword.

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Quite a Glittering Assemblage by GAvillain

Recommended by EmperorMax2019
Crossover with: Gotham, True Blood, Once Upon a Time, Marvel Ultimate Alliance, and others
Status:
- Quite a Glittering Assemblage - Complete
- Villains of a Sort - Complete
- All the Forces of Evil - Ongoing
Pairings: Maleficent/Hades, Loki/Doctor Doom, Ursula/Fish Mooney, Jafar (KH)/Captain Hook (OUAT), Russell Edgington/Steve Newlin, Evil Queen (KH)/Cruella De Vil (OUAT), Riku/Sora, and others.
Synopsis:
- Quite a Glittering Assemblage: Xehanort may have set up a perfect house of cards, but Maleficent is intent on knocking it down. She's been irrelevant for far too long, and now, with a little help from some villainous friends, she's going to take back her crown.
- Villains of a Sort: Maleficent and her Overtakers from across many worlds were defeated, and their schemes to harness the power of the Book of Prophecies were undone thanks to Sora and his friends. Now they find themselves in the clutches of the fearsome Master Octomus. The Overtakers may have been villains and cutthroats, but the Master is something infinitely worse. However, the villains have been down and out before, and one thing has always remained true: never underestimate them.
- All the Forces of Evil: The Olympians have fallen, and the Overtakers, Maleficent's team of villains gathered from across many worlds, are in power. More petty and vengeful than the previous pantheon of gods, the Overtakers now have turned their sights towards expanding their power to encompass the rest of the cosmos. Yet the path to power is not a simple one, and the Overtakers may find truth in the phrase "it's tough to be a god."
Comments: A thoroughly entertaining series about a group of villains who come together around a common goal of conquest and destruction, fighting off even bigger threats and other rivals in their quest for power and becoming a Family of Choice along the way. The first fic was completed and the second one started before Kingdom Hearts III was released, and while it does incorporate later reveals from the games into it's storyline, it does remain it's own story without trying to fit itself into canon.
Now has a trope page.

Realms Untold: Seekers of Light by FedoraChar

Recommended by: Darth Taco
Crossover with: Various Nintendo games
Status: Incomplete
Synopsis: The borders between worlds have become blurred as a particular un-named franchise has grown overly complicated. Now it's bleeding into other realms, leaving Pit and the lost characters of Nintendo to deal with the increasing problem of the Heartless. But will finding a Keyblade really solve matters?
Comments: Though still quite unfinished, it already features characters from Kid Icarus, Pokémon, and Fire Emblem, with more to come. It is extremely well-written and definitely worth reading and following.

Remnant of The Key by lyokoMARVELanime

Recommended by: thedarkone1995
Crossover with: RWBY
Status: Ongoing
Synopsis: Long ago, a young man went on a long journey to different worlds. He made many friends, found many things relating to the past, and saved so many lives as he pressed forward to the future. Many people of that past were lost, but thanks to the boy, they were able to come back, ready to fight for a brighter future once again, and together, they all averted a grave catastrophe. Sadly, their victory did not come without a price, and even now, they were still feeling the hurt that came with their loss, but none more so than the boy himself. Despite the sorrow he felt, the boy would soon find himself being called upon again, as the key to saving so many, as a new destiny would begin to unfold for him, but that would not be for a while. This will be the start of a new journey for the boy and three of his friends. This will be the day that they had waited for, to begin a quest to recover what they had lost.
Pairing(s): Sora/Ruby Rose, Lea aka Axel/Yang Xiao Long, Roxas/Xion, Ventus/Weiss Schnee, Aqua/Terra, Jaune Arc/Pyrrha Nikos, Riku/Namine, Kairi/Oscar Pine
Comments: A magnificent work thus far, adopted from fandombard12, lyokoMARVELanime has recrafted this crossover to encompass the events of Kingdom Hearts III except when Xehanort struck Kairi down, Sora WASN'T able to bring her back. As a result, Sora has lapsed into a Heroic BSoD, and has been training every single spare moment he has, from dawn to dusk, until Riku sends word that Yen Sid, who happens to be friends with Ozpin, who later turns out to be a Shipper on Deck for Roseheart aka Ruby x Sora, wishes to see him. Turns out Kairi's Not Quite Dead, thanks to a spell the Master of Masters had placed on No Name, and thus Sora, Roxas, Lea, and Ventus journey to Remnant and become the Huntsman Team SLVR (pronounced "Silver"). However, where there's a keyblade wielder there's bound to be Heartless and Nobodies this time led by Braig aka Xigbar aka Luxu, who's apparently aligned with Salem. Needless to say, hijinks and action ensue... and Sora finds himself developing feelings for Ruby that make him question his feelings for his old flame...

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RWBY: Aqua's Mission by TPoynt

Recommended by JKCIP
Crossover with: RWBY
Status: Ongoing
Synopsis: Aqua didn't know what would happen when she fell into the Realm of Darkness. The last thing she expected was having to raise two little girls. With one of them being a Keyblade Wielder, she has her work cut out for her.''
Comments: Aqua being a mother for Ruby and Yang offers a unique dynamic to the story. Not does Ruby and Yang have a mother figure, gives them unique and good character development. Aqua as a mother feels well balanced and fresh for the story.

The Shrouded Path by Arcawolf

Recommended by Madame_Newbie
Crossover with: Silent Hill
Status:
- The Shrouded Path - Complete
- Those Who Fight Monsters - Completed
Synopsis:
- The Shrouded Path: What started as a routine mission becomes a nightmare when Ven disappears. After tracing his path to a strange town, Aqua and Terra find themselves ensnared by a power darker than any they could have imagined. It will take everything they have just to escape intact. AU.
- Those Who Fight Monsters: It's been eight months since Silent Hill, and life for Terra, Aqua and Ven is just starting to go back to normal. But when a mysterious couple crash-lands on their world , it becomes apparent that things aren't finished yet. Vanitas is back, stronger than ever, and he's willing to do whatever it takes to get what he wants.
Tags: Mature Themes, Dub-Con, Sexual Themes
Pairings: Terra/Aqua
Comments: Despite having those tags, this fic manages to keep the Kingdom Hearts tone but slowly descending into the madness that is Silent Hill. This fic will wring you and doesn't hold back its punches.

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Sora and the Princess of Power by SPARTAN-X013

Recommended by Arcanum99
Crossover with: She-Ra and the Princesses of Power
Status: Ongoing
Synopsis: Sora, Donald and Goofy are on the start of their new adventure! Too bad they get sucked through a wormhole almost right away. Having crash landed on Etheria, Sora is determined to find Donald and Goofy, and the missing pieces of the Gummi Ship. Along the way, Sora will meet and befriend She-Ra and the Princesses of Power, and help the Rebellion defeat the evil Horde.

Starchaser by The Doomkitten

Recommended by: geekyasari
Crossover with: Steven Universe
Vanished from the internet. Please post a link if found.
Synopsis: Connie Maheswaran: heroine, nerd, jam bud (formerly), knight, part of an experience, and occasionally a scared little girl. When everything she's ever known is ripped away from her one fateful night, Connie finds herself on an isolated island chain, protected from the encroaching darkness by some primordial magic. There, she must contend with the ashes of her past, prophetic dreams, her own insecurities, and a trio of kids determined to drag her out of the dumps by force if necessary.
Comments: Although the fic's focus lies primarily with a Steven Universe character, it still has the accurate characterization of the main trio and excellent, if somewhat verbose, writing. The author has also written it with the intent of being understandable by people not fans of Steven Universe, so you don't need to worry about proper franchise knowledge.
Status Update: unfortunately this story appears to have died because I am unable to find it anywhere, even on The Doomkitten's Archive of Our Own page.

Sword Art Kingdom by Jacob Pendra-Huth

Recommended by Francis X.
Crossover with: Sword Art Online, and various other video game and anime franchises.
Status:
- Kirito & Asuna Story:
  - Sword Art Kingdom - Complete
  - Sword Art Kingdom II: Dimensional Bonds - Complete
  - Sword Art Kingdom: Falling Fantasy - Complete
  - Sword Art Kingdom: Final Mix - Ongoing
  - Sword Art Kingdom III - Ongoing
- Philia Story:
  - Sword Art Kingdom: Heart's Origin - Complete
  - SAK: Path of Memories - Completed
  - SAK: Treasured Memories - Ongoing
Synopsis:
- Kingdom Sword Art Kingdom: When Kirito and Asuna take on a mysterious quest to fight a new monster, they took in more that they bargained for. They ended up not only going to a different dimension, but also aiding a trio of good friends on their quest. Join this exciting adventure full of humor, romance and action.
- Sword Art Kingdom II: Dimensional Bonds: A new threat is coming about, and Sora, Kirito and Asuna are ready for the job. They are sent to Kirito and Asuna's dimension, where they have to find the Keyholes of Bonds, stop the flow of Heartless and Unversed, and stop the enemy from reaching Kingdom Hearts. It's up to Sora, Kirito, Asuna, Donald, Goofy and Yui to save the dimensions.
- Sword Art Kingdom: Falling Fantasy: The Mark of Mastery has begun for Kirito, Asuna and Leafa, where they must unlock the seven Sleeping Keyholes. However, trouble follows them into their trials, making their test more of a challenge. The Organization already got Leafa in their sights, and are attempting to bring down Kirito and Asuna, too. It is up to the two to get to the bottom of this, and save Leafa.
- Sword Art Kingdom: Final Mix: These stories happen within 'Sword Art Kingdom' and 'Sword Art Kingdom II: Dimensional Bonds'. They have little to no effect to the main stories whatsoever, though they might be important in the stories onward. This mainly involves the characters of Sora, Kirito, Asuna, Yui, Leafa, Riku, Kairi, and many other characters from the stories.
- Sword Art Kingdom III: The final series of the Xehanort/Younsol arc, with Sora, Asuna, Kirito, & their companions banding together against Organization XVI, as well as another threat that is gathering darkness. With two dimensions on the line, the heroes must seek out not just the Guardians of Light, but the Lost Princesses of Heart, in order to fight back the darkness... no matter the cost.
- Sword Art Kingdom: Heart's Origin: A prologue to the first Sword Art Kingdom, and taking place at the beginning of Kingdom Hearts. This tells of a forgotten friend of Sora, Donald, Goofy and Jiminy; a girl named Philia. As she was freed from SAO, she ended up in Traverse Town, instead, with no memory of her past. In order to discover it, she joins Sora and the gang on their journey to stop the darkness.
- SAK: Path of Memories: Following the story of 'Sword Art Kingdom: Heart's Origin', Sora, Philia and friends end up discovering Castle Oblivion, where Sora believes he will find someone important to him. However, what they discover is that they start to lose more of their memories, except for Philia, whose bond with her friends is slowly being severed by one of those who guided them to the castle.
- SAK: Treasured Memories: Taking place during SAKII: Dimensional Bonds. Over a year has passed since Philia left Sora in Castle Oblivion, and she ends up getting stumbling into the other dimension, where she gets saved and tasked by Mistress Gretinal to find who is responsible for a new breed of Heartless. New friends, new worlds, and for Philia, new memories to seek out.
Pairing(s): Kirito/Asuna, also a bit of Sora/Kairi, but the romance gets heavier in later stories.
Comments: Great writing all around, this writer clearly sees the light and darkness (haha) of both series, and brings out the best in this great crossover that adds new elements while keeping true to the games and the story left behind in the SAO anime. And this is just the first in a whole new awesome series!

Thieving Hearts by Catch358

(FF.Net Link

)

Recommended by VictorioMWolff-Haddock
Crossover with: Persona 5
Status: Dead; last updated May 21st, 2021
Synopsis: Following the events of kh3, Kairi and Naminé set out to find Sora using the gummiship. However, their search goes horribly wrong and they end up in the streets of Shibuya City where the mysterious 'Phantom Thieves of Hearts' resides. What will become of the girls in a world of hearts and thieves? Will they find Sora and possibly find some love along the way or will they lose their hearts trying?

Fanfic Recs / Kingdom Hearts – Crossovers

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