Luffy lands nearby Ponyville due to a fight that happened not so long ago. During his stay, he encounters, befriends, and soon has adventures with six certain ponies that will shake Equestria.

One Piece X My Little Pony Crossover
Teen Rating - Multiple use of cuss words.
Gore - Bits of bruises and cuts, nothing too serious.

Part 1 - Introductions
-Chapters 1 to 7
-Luffy's arrival attracts curiosity of the ponies as he demonstrates his numerous abilities causing a disruption of peace. Though not meaning to do trouble, he gives the six ponies the next few days they'll never forget.
Part 2 - Ponyville Arc
-Chapters 8 to 16
-Luffy finally makes a move that will plunge all of Equestria into war. Alliances will be revealed as well as actions no one ever knew about until now, and the fate will be determined by Luffy and his crew's actions.
Part 3 - Griffon Arc
-Chapters 17 to ???
-The time to enter the war is now. Luffy along with Twilight and the rest of the team will go into Griffon turf in order to end the feud as well as finding the rest of the Straw Hats.

Takes place after two year time skip
Takes place before Discord was freed and wreaked havoc
Inspiration and better story in the link.
One of the many One Piece X My Little Pony crossovers with potential
Ace-Catel the artist

One Piece X MLP Crossover

A emergency trip to Zecora's leads Fluttershy to find a strange pony with a straw hat. Unfortunately, he scares Fluttershy off with his talk of eating other animals. The strange pony's arrival in Equestria sets off a chain of events that threaten plunge the peaceful kingdom into an all out war. Twilight and her friends, along with the new pony may be the only ones who can unravel the mysteries that surround Equestria and save it from falling apart.

Now with TV Tropes!

New Cover Art by Droll3

A teleportation spell gone wrong teleports the Straw Hat crew to the land of Equestria and chaos ensues.

Get ready for laughs, awkward situations, and all out war that saves the nation of ponies!

Takes place post time skip in One Piece between Punk Hazard and Dressrosa, along with pre-coronation Twilight

MLP: FIM (C) Hasbro
One Piece (C) Eiichiro Oda

Have you ever heard of a mare named Faust? She's an Alicorn, just like the Princesses, but not a princess herself. Some say she's a queen, some say she's their mother. The truth, well... she's really overworked. And with her duty as The Equestrian Archivist she has a pretty demanding job. But what happens when this overworked alicorn decides that she wants to take a vacation in Ponyville? Furthermore, what'll happen when she skips out on her job to take that vacation?

(My first story! A different take on Fausticorn, I've seen her given a general persona that just doesn't seem like what I saw in the original art. So here's my idea of what she might be like. Tags will be added as the story continues.)

HOLY.... F-Featured on December 21 2014! Thanks guys! That is amazing!

Fluttershy and Twilight go in the forest to search for Angel when he disappears. Trying to get back to the cottage as fast as possible, the two find Angel, and two other strange creatures. Perhaps these strange creatures are tied to the item that Fluttershy found in the forest on her morning routine, or maybe just a new species awaiting to be cataloged.

Zelda crossover. Both titles belong to their respective owners.

Meet Pipsqueak.

Pipsqueak, or "Pip" as he prefers to be called, has quite the imagination. There are times when he is a fearsome pirate, scourge of the seas of Equestria. There have also been times when Pipsqueak has fantasized about being a gallant prince, traveling the land, saving fair maidens, slaying wicked beasts, and being hailed as a hero by his peers. Not once did he ever imagine he'd get exactly what he wished for in the form of Princess Luna adopting him, making him an actual prince! Soon enough, Pip learns that being a prince isn't as glamorous as he thought it to be, and that there are more than a few downsides to being a part of the royal family. One in particular downside coming in the form of a nuisance named Blueblood.

On the other side of the coin, Princess Luna must adjust to her newly-found position of motherhood, balancing the task of providing her adopted foal as normal a life as possible for a young prince, while also making sure the nobility and paparazzi keep their hooves out of their business. Fortunately, this mare not only has the entirety of the Royal Guard, including her own Night Guard at her disposal, but her sister and niece also happen to be fiercely protective of the newest member of their family.

Inspired by the anime movie 'Wolf Children' and the MLP Fic 'Raising a Human in Equestria'

It's was a normal morning for Fluttershy, doing her usual routine and caring for the animals of Ponyville. She thought it would be a normal day for her.

Fate thought otherwise.

Follow this cute journey as Fluttershy cares for a human that can transform into a wolf by its free will. Of course this story isn't going to be all sunshine and rainbows for the two, for Fluttershy has to keep this human a secret from all of Ponyville (Minus her Friends) and the two rulers of Equestria.

Featured on November 1st, 2014! Thanks everypony! I'll do my best in keeping this fic interesting!

Chapter 1 Audio Reading
Chapter 2 Audio Reading

Once a soldier of Princess Luna's guard, an Earth Pony whose name was lost to the ages, was killed by Celestia for a revolt he lead against her after she banished Princess Luna to the Moon. Now a thousand years have passed and he wanders the Everfree forest as a spectral ghost. That is until he comes across a certain orange filly with a purple mane. How will they all react to the new discovery of a Headless Horse? How will he react to seeing Princess Celestia and Luna again after a thousand years? Especially after Celestia had him killed.
The mysteries of the Headless Horse will be revealed...

(This isn't really a full on gore story, I just put it there because there are occations where blood is spilt and ponies die. So don't expect somepony to have a blood filled, serious injury all the time, just maybe occationally).

A few months has past since Spike the young dragon found love in the most unlikely of places, in our goddess of the night princess Luna and he could never be happier. Now he wants to share his happiness with his best friends the elements of harmony and Luna's sister princess Celestia but he is also faced with a choking reality. A dragon pony relationship has never been heard of on Equis let alone Equestria. Will the ponies he has been close to for so long, accept his new found love or will they be judgmental and think harshly of him for his choice. This is the thought that worries him, but sometime love is worth even the greatest of threats.

also for those who may have noticed, i changed the cover photo because the original photo i had for it disappeared and i could no longer find it. so i had to switch it to this one because it was the best one i could find related to the topic.

Advisor and Pre reader: ix12

the original story spikesXluna was made by made by mallajong1 and i have been allowed to make a sequel by him.
heres the link to the first one
http://www.fimfiction.net/story/50304/1/spikes-luna/gift

Plot: A hero of an expedition to lands far away returns a hero on the Canterlot stage. However he may not be as kind as he seems after launching the Elements of Harmony to a distance land. Needing protection and a boat to take them home the ponies quickly learn the wonder and terror of sailing the Grand Line with the rubber human Luffy and his Straw Hat Pirates, freshly united on Sabaody Archipelago.