Nevermind....it's a dynasty warriors style game. One Piece Pirate Warriors. The entire story is perfect for an RPG, no idea why they haven't done it yet.
It's a damn shame nobody has created a One Piece RPG, the story is PERFECT for it. All the different powers people have would make for dope fights. Imagine starting out in Luffy's village and going around recruiting crew members, maybe in the game you could recruit people that didn't join in the manga (like Paulie or Vivi). Maybe years from now after the series is over somebody will make one that covers Luffy's entire journey from his hometown to Raftel.
Come to think of it, a MMORPG would be dope too. Creating your own pirate crew and fighting other crews (and Marines) online would be epic.