Teams 7, 8, 9, and 10 are all sent to an old mission with horrible results. The young ninjas and their masters are all sent to a new world where pirates sails all over in the look for a treasure named the One Piece. The ninjas all team up with a pirate crew named The Straw Hats pirates and go aboard in their mission to explore a sky island.

After the Great War of Wano, the Straw Hats are ready to set sail towards Elbaf. However, in the sky the Supreme Deity thinks that the pirates are the perfect group to save her world from the Demon King army. While there the crew meets a person called Meliodas, a princess named Elizabeth, and a pig. There they will help find the Seven Deadly Sins and fight demons!

After the events of Skypiea, the Straw Hats come across a mysterious figure that directs them into an island with a weird symbol. There they meet a bunch of people that are from a new world. A world is full of magic, friendships, and guilds. Now while they are stuck in these worlds is up to Fairy Tail to sail together with the Straw-Hat crew in the hope to find their way home.

AU. Luffy is a regular teenager with the quirk of rubber. Not knowing of what to do with his life he decides to apply for the UA hero course just for interest. Little did he knew that he and his friends would bring a lot of impact to the hero world. Saving people, stopping bad guys, ending horrible plans but also being a teenager that captures the hearts of many. Luffy x Harem.

The Straw Hat Pirates show up at Destiny Islands from Skypiea and meet Sora and his friends. But when the Heartless invade, they are all separated. Now Luffy and Sora must join forces to find their friends, and defeat the darkness. KH/One Piece crossover. Cover image by Kiyomisa on Deviantart.

A self-insert lands in the MHA world, only to think she's in the One Piece one. She proceeds to bring the latter's insanity to the former by copious amounts of Devil Fruit jailbreaking. Watch as the Copy Woman turns logic upside down and makes you question everything you knew, or her name isn't D (it isn't, she just calls herself one).

Her story had to be one of a kind, one that not even the craziest person in existence would ever believe nor tell, it was surreal even for those who still believed in legends and fairytales… and even more for herself. How? Someone would ask. She was dead, or rather she should have been. So then… why was she in a laboratory of some sorts?

(Cross Posted on AO3)(Rated M) It's time for Hadrian to return to Hogwarts only this year he has a chamber and a sociopath to contend with. How bad will this year go that he needs to continually hide from his peers and his guard?

In the Battle against Kaido luffy falls of the island and is somehow transported to the world of DXD find out what will happen next.

A Tower descends onto earth wiping out the entirety of New York. 1 Million people are randomly chosen and teleported to the tutorial of the tower after completing the tutorial you get teleported to the first floor which is... The World of Naruto. Jackson is one of these 1 Million people and now has the goal of climbing the tower to the top. OC with gamer like abilities.

Born with a unique quirk, Midoriya Izuku strives to become a hero. THIS AIN'T MINEEE

Gracias a un acto de venganza contra Kuroinu... Un Luffy que esta cerca de completar los dos años de su entrenamiento termino siendo invocado a otro mundo. Para las Princesas Guerreras eso podia ser una salvacion de un final tragico, para Kuroinu la perdicion de sus sueños. Despues de todo Luffy poseia un gran poder.

One fateful day Jaune Arc decides he doesn't want to be a huntsman anymore. Instead, he wants to set sail to the Grand Line, find the One Piece, and become King of the pirates. Most of his friends may think he's crazy, but that's okay. At least some of them are willing to join along on his quest.

Luffy has defeated Kaido and made it to Egghead Island with the rest of the crew, when Luffy gets separated from his group. He finds a strange item, which sends him to a whole different world(some of these chapters might be really short).

When a secret organization makes its move Naruto of the Ninja World and Luffy of the Straw Hat Pirates and their friends must unite to take out this evil group The longer they're together the more the horrible truth of the relationship between the World Government and Ninja World becomes clearer and on top of that the leader of this organization knows them all personally. Re-upload

Sabo gets a Second chance in life and unexpectedly he has a baby sister watch him as he goes on an adventure with a friend by his side that he fished out

One born on the Grand Line. One born in East Blue. These two people cross paths in a simple village with dreams that seem impossible. One wants to be King of the Pirates, while the other strives to be the Strongest Man in the World. Bonds are forged and they vow to travel the seas together when they are strong enough. Now they plan to turn the world upside down. OC Naruto. Harem

The Great Pirate Era has now come! People all over the world are searching for the One Piece, the treasure of the Former King of the Pirates, Gold Roger. You are joining your childhood friends, Monkey D. Luffy, who wants to be the New King, as well as Twilight Sparkle and Sunset Shimmer, who want to learn more about the knowledge forbidden by the World Government.

"Looks like we're going to be partners from now on. Together, we'll see all this world has to offer." When Incumbent Champion Lucas was called in to investigate a mysterious buildup of psychic energy in the Solaceon Ruins, he didn't expect for his wish from so long ago to come true, in potentially the worst (or best) way possible.

Held high as the God of Shinobi in the world of Ninjas and Samurais, Hashirama Senju's powers now traverse space & time to reach the world of Pirates and Marines. A young man from Earth, reincarnated into this world, now had this power that can reshape the entire world. With such powers, he reckoned he had a goal to fulfill. SI, Harem, R-18

A Ben 10/One Piece crossover; I woke up this morning with this on my mind, and I had to share it with you all! I hope you enjoy. It's going to be a task I hope you'll enjoy. [Bonus: Ben will have the Ultimatrix (Well an O.C version called the M-Model; He also has the Haki's; all three. but he'll have to get training to access them full time)]

Violet Potter is the twin sister of Boy Who Lived. Given to the Dursley at a young age she is treated no better than a slave. She is saved by the Goddess of the blues who gives her the task to travel her seas while armed with gift to assist her. Adopted from TheBlackSeaReaper, formerly Chaos of the Sea

After being given a collection of DVDs of an anime they've never heard of, Class 1-A and their teachers decide to watch it in their free time.

Thank you Emma Iveli for your permission to create this story. I'm doing my best to make it fun and twik it a little. it's basically my hero academia watching my heroes reborn in a theatre similar to all those watch movies or alternate universe stuff...

Class 1-A are training daily to become future heroes of Japan, but being heroes may need to be put on hold temporarily as they encounter a villain in a surprise attack, that leaves some of the class stranded on a floating raft that is found by a pirate crew who have just arrived into the New World.