The Pirate King's New Rival

Hi everyone this is my first story so please be a little gentle.

Summary: Story starts off after the Fishman arc in One piece because I don't know where he's going with that and don't want to try and fake it. Anyway we will see the adventures of Luffy and the Straw-hat crew along with a romance between Luffy and Hancock. But a mysterious figure is starting to appear and will soon affect everything on the Grand Line.

(I know that was terrible but this is my first so sorry)

Prologue: Grand Line near former Marine HQ

A lone ship approached a group of marine battleships. It was a small boat only really able to be used by one person, but this boat had something. It had a jolly roger, a pirate flag. The flag depicted a skull with horn (think Ichigo's full hollow mask) and if you look at then on their left there was a black feathery wing and on your right a white leathery one.

On the lead Marine ship:

"Sir a pirate ship has been spotted."

" A pirate ship where?"

" Two points off the starboard bow, and it's more of a boat sir, it's not even armed."

"That looks like Mihawks boat, but the symbols different. That symbol, it's not one I've seen before."

" An unknown pirate sir? Should we open fire?"

"No, first we'll ask him or however it is to surrender just to make sure there isn't somehow a mix up or that it's a bunch of kids playing pirate."

" Well sir we can see the person on the ship and he's just sitting there looking at us."

" Has he done anything?"

" No not even move, and you can't really tell if he's staring because there's a cloth over his eyes."

"Hmm. Well it doesn't matter. Get close so we can ask him face to face."

What he didn't know was that by getting close to the boat he put himself in the range of all the fury of something that no one should see.

"Sir, we would like to ask for your immediate surrender and to escort you back to a Marine base." A lowly marine said.

There was no response; the battleships just kept getting closer.

" Sir did you hear m-."

Then it happen the man jump out of his grabbed a long black sword with a navy blue flame design on it (cool huh) and shoved it right into the man's throat. Before anyone could react the man or demon simple raised his sword and cut the battleship in half. As the shock subsided among the other ships the screams did not. The lone figure jump from ship to ship destroy whatever he laid eyes on. This massacre ended in a 0-7 win. Zero wounds on the man for seven battleships.

This news would soon spread throughout the world and especially the grand line. For everyone knew. A new horror was just about to enter the New World.