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

After sailing into a mysterious fogbank, the Straw hat pirates end up in Ponyville. How will they adapt to this new environment? How will Zoro use swords without arms? Will Nami be able to get them all to focus and find a way back home? What will Luffy do being unable to EAT MEAT?

This story takes place after the Thriller Bark arc in One Piece and before Season Two in FiM

Surgeon of Death. Supernova. Pirate.

A colorful unicorn that resides in the magical realm of Equestria doesn't quite fit with the rest of Trafalgar Law's monikers. Yet, that is the situation the multi-million bounty pirate has found himself in. It's just for a few days and then he can forget all about Equestria. Provided Pinkie doesn't drive him mad before then.

A My Little Pirates Special.

After the Straw Hats' battle at the Shabondy Archipelago, Sanji finds himself on an isolated island inhabited by ponies. There are a lot of problems to solve before he can find his captain and crew, but at least he has two extra legs to use now.

A continuation of Fullmetal Pony's Set Adrift story about Sanji. Disclaimer: This story's Sanji entered Equestria as a pegasus instead of a unicorn. It really doesn't change anything about FMP's chapter.

Check out the original story about Luffy for more background information that might only be implied in this one.

Rated Teen for the usual One Piece manga violence.

Edit: Wasn't easy to find a blue pegasus Sanji, but here we go. A placeholder until the purely hypothetical day that I commission a better picture.
I don't think the guy (or girl?) who drew this will ever be aware of my story, or my use of his picture, but I will nevertheless credit him and link to his Tumblr. Because it's the honorable thing to do and I don't want to be an ungrateful plotface.