Crossoverfanfic Stories

Buck has spent years letting the 118 believe he was just a guy with a messy past and a lot of odd jobs before becoming a firefighter. But the truth is bigger. Before the 118, Buck belonged to an elite SEAL team. The kind of team that became family. The kind of team that saw things they still do not talk about. Jay, TK, Steve, Hondo, Jason, and Buck survived ten years together. Then one final classified mission broke everything apart. Buck left that life behind and tried to become someone new. But when Jay Halstead shows up at Station 118, Buck realizes the past is not finished with him yet. And neither is Lena Carter - the woman who knew him before everyone else did.

After Sonic's latest adventure, Tom and Maddie decide to take him on vacation in Brooklyn where the blue blur befriends a plumber named Mario. While working underground to fix a water main and when Sonic goes to investigate where Eggman disappeared to, Sonic, Tails, Knuckles, Tom, Maddie, Mario and his little brother Luigi are transported down a mysterious pipe and wander into a magical new world. But when the brothers and Tom and Maddie are separated, Mario, Sonic, and their new friends embark on an epic quest to find Luigi and Maddie. With the assistance of Mushroom Kingdom resident Toad and some training from the strong-willed ruler of the Mushroom Kingdom, Princess Peach, Mario taps into his own power and Sonic learns new tricks with his powers, the origins of the Chaos Emeralds, the truth about his past, and how he ended up in Longclaw's care. Think you know the Blue Blur? Think again. (Sonic the Hedgehog and all characters related to Sonic the Hedgehog and it's movies are owned by SEGA and Paramount! NOT ME!!! Also Super Mario and all characters related to the Super Mario franchise and its movie belong to Nintendo and Illumination! The following is a non-profit fan based fanfic made for entertainment purposes only! Please go support each of the franchises official releases and their official material!)

BIG hiatus rn •| Kirby, who had plans to play with his friends, ended up dozing off under a tree. By the time he wakes up, he finds himself lying not under a tree, but under the sky of a different dimension. Wait, a different dimension? How'd that happen? |• •| 𝘔𝘺 𝘏𝘦𝘳𝘰 𝘈𝘤𝘢𝘥𝘦𝘮𝘪𝘢 × 𝘒𝘪𝘳𝘣𝘺 𝘊𝘳𝘰𝘴𝘴𝘰𝘷𝘦𝘳 |• I just realized this may have spoilers for Kirby lore/endings in some way. Spoiler warning!!!

(May contain swearing and mature violence. Mischaracterizations ahead!) The sudden supernatural phenomena dubbed "The great slip" occured, which change the whole reality forever. The Great Slip does not discriminate; Humans, animals, monsters, plants, dinosaurs, alien lifeforms -- anything that is alive can be taken, even the non living things such as objects, vehicles, buildings, even corpses, were all included. Some who Slipped are fortunate enough to return back to their home universe. Most do not. Some returned but different. Some sliped in different universes in different timelines, in different possibilities, alternate realities: A sky ruled by prehistoric predators, world war era battlefields, medieval periods, futuristic cities, empty worlds where civilization died long. And worse it includes the sudden appearence of machines -- may comes in different size, shapes, forms. They can change themselves if they wished too. They levitate, hover, or fly at impossible speeds, striking with mindblowing precision. Attacking any living things, destroying cities, shatter infrastructure, and erase civilizations. While leaving the plants untouched by them. These menaces are found in every universe touched by the great slip phenomena. They do not hunt food. They do not defend territory. They do not communicate. They simply kill what's alive and sentient Civilizations throughout different universes, of different timelines, learned how to fight back these beings, some named them, and the slipped ones learned to adapt. As anytime and anywhere, from the moment they blink, they found themselves in unfamiliar area. [SERIES TO CROSSOVER!!!] Arpeggio of blue steel Demon slayer Azurlane Invincible Lobotomy Kaisen

What if the bullied super heroine from Paris wins an essay competition for a free trip to Gotham city where she and her best friend are living to later in the year? What happens when Ladybug meets the anti-hero of Gotham. Feared crime, Lord Red Hood. Or when the hottest of gothams prince's saves her from her abusive class... What happens when she can't decide between the civilian Jason Todd, legally dead son of Bruce Wayne, and the rogue member of the bat family? Heyy!!! So, at the moment, the first few chapters of this book are being edited and extended, but you can read it whenever, vote, and comment!! Also, tell me if I mess shit up, I really appreciate it!!! See you in the book!! 20 CHAPTERS GUYS!!! second big milestone!!!

Hayley is the twelve-year-old sister of Dean and Sam Winchester. She has always been extremely close to both of her older brothers and they have both always been extremely protective of her too. Dean and Sam have been looking after Hayley since their dad John went missing a little over six months ago. It hasn't been easy but the three of them have managed so far. What happens though when the brothers make the tough decision to leave their baby sister with their paternal aunt after getting word from a friend of John's about his possible whereabouts leading them to wanting to try and find him? How will Hayley cope with being away from her big brothers and living in her aunt's world which involves a certain MC and all that comes with it? **READ TO FIND OUT WHAT HAPPENS*

Briarwood University. The shabby uneven red bricks, the weird classes, weird professors, and then there's the Fraternities and the Sororities. Everything is crazy and weird. (Contains OCs and Fandom Crossovers) The farther you indulge in the mysterious ways of Briarwood university, the more you'll wonder what will happen next.

Halloween is upon us, join the Cross Dimension Crew and their friends as they tackle new problems, and get into all sorts of misadventures!

An open secret. I am also fan fic writer Junko from AO3 (http://archiveofourown.org/users/junko/profile). A friend of my son's has ask if I would post some of my Bleach fic here, so here is a crossover Free!/Bleach fic that I wrote. Here's what I said originally about it on AO3: Summary: After the defeat of Aizen, Ichigo has lost his superpowers but not his skills so he's been hiring himself out to any sports team looking for a strong player. When Nagisa Hazuki approaches Ichigo to join the Iwatobi High School Swimming Club, something piques Ichigo's interest.... Notes: This was written for artisticvulpes and in response to this post: "If all the members of the Free! Iwatobi Swim Club are people who have names that are normally for the opposite gender. Why are there no Bleach crossovers with the team meeting Ichigo Kurosaki? I mean come on, Nagisa went crazy getting Rei to join just because his name fit the pattern. Why not do something similar in a crossover like during the seventeen months when Ichigo was a sports club member for hire?" I love Free! Iwatobi Swim Club ALMOST as much as I love Bleach, so I said, "I'll do it!" Similarly, I wrote this for fans of BOTH shows. (I have no idea how much crossover there will be.) So, that's to say, I don't explain a lot about who/what Ichigo is, nor do I go into huge amounts of backstory of the Free! team. Hopefully, if you're not a fan of both shows and you still want to read it, it will still make some sense to you. A note about the relationships and the rating. One of the things I love about Free! is that, to me, the characters all feel very gay, but none of that is terribly explicit in a very innocent, teenage way. So, I've kept this entirely 'g' rated (with the exception of Ichigo's language) and while the Free! team is 'out' in their heads (with the exception of Rin), the romantic elements never go further than handholding and cuddling.

Blair Jones... How do I start to describe Blair Jones. Blair Jones is flawless. She has two Gucci bags and a Silver Lexus. I hear her bow and arrow is insured for 10,000 galleons. Apparently she does ambrosia commercials... In Japan! Her favourite movie's mean girls. One time she met Percy Jackson on a boat, He said she was pretty. One time she bet me in capture the flag... IT WAS AWESOME. Also one small detail... she's not only a demigod but a wizard? 5 new votes/comments = new chapter

A sudden rift split the sky- tearing through the air, flinging people as if it were searching for something. And then... it took him. Monkey D. Luffy vanished into the void. The rift snapped shut. But Luffy had already crossed into another world. Dazed and breathless, he stumbled into a land unlike any he'd known- and there, he met Son Goku. A warrior bound to a mission: to hunt down entities that defy reason itself. But the moment Luffy laid eyes on Goku, something shifted inside him. A feeling he'd never known. Something fierce. Something undeniable.

Ground211's Original Fanfic. 2 little classes walking in the day. Its okay cause they're both gay! And the insie- ------------------------------ Read and find out. P.S.: My Hero Academia Fanfic with some OC's. Note: We don't own anything except our OC's. Kohei Horikoshi owns My Hero Academia. Marvel owns Avengers, Deadpool, etc......

The epic TRR crew has gone their separate ways. Maxwell and Riley have split apart just before the wedding. Fast forward over seventeen years later to the heart of New York City... Annabelle Mason finds herself longing to meet the father she's never known and runs off to Cordonia to find him. Will it be the father-daughter relationship she's always dreamed of, or will the evil forces that drove away her mother threaten to keep their family apart once again?

Sparkster the rocket knight has left Konami city due to failing to do the duties of his boss. He returns again to help Crash and Spyro with the emeralds for sonic the hedgehog. He is later kidnapped and taken to a cell but the real problem occurs when video game characters are used for working out of their free will. Can Sparkster save them?

Tanjiro died defeating Muzan but was shock to see he was in a new world. In that world, he meets a white hair half elf. Now he helps her because of his good heart, while also trying to find a way back home. I do not own Demon Slayer, Re:Zero, or any images I use in this story.

Have you ever wondered what would happen if the nations of Hetalia: - Did something else other than punching each others' faces at world meetings, or saving the world from aliens who paint everything white? - Were wizards and mages who lived in Fiore? - Did what Fairy Tail characters did, like going on missions and competing in the Grand Magic Games? - Possessed magical powers? If you said yes to at least once, you are in for a great treat. This book has all the questions listed above, so what are you waiting for? Click the "read" button right this second!

NOTE: UNDER HEAVY EDITING NOTE: DO NOT READ IF YOU HAVEN'T PLAYED WATCH OR READ ABOUT IB OR HETAONI. YOU HAVE BEEN WARNED. Two people, on opposite sides of a gateway find themselves in a rather life-threatening situation. Louder and louder the monster pounded on the door as Feliciano looked for a way out, at the same time a confused nine-year-old stared at the strange painting (like the others are not), hoping it is a gateway out. But instead, of an exit it became an entrance for another.

Tengen Uzui is one of the last members of the Uzui family. He decides to become a Magic Knight, joining the Black Bulls because of the flamboyance of one grey hair kid. He loves the flamboyance of the group and he also runs into an old friend who might have feelings for him. I do not own Demon Slayer, Black Clover, or any images I use in this story.

The last thing I wanted to do was become a superhero. Superheroes are lame anyways. If you told me a year ago I would be in a superhero team -me the solo thief from the streets? Never. But in my process to uncover the details behind a mastermind villain plan, I found the last thing I expected to get from this adventure: friendship... and possibly love?

This is my first crossover fanfic. Mickey and Oswald are trying to rebuild Wasteland to make it as good as it can be, but they accidentally send thinner (along with the Blot) spilling out of the TV and into the real world, where it falls onto a circular portal... In Skylands, the Skylanders are minding their own business when suddenly, some strange green substance comes via portal and starts melting the place apart and flooding the sky. They are met by two strangers from another dimension who have come to clean up the mess they accidentally caused.