Well, it really depends on your personal interests. If you're into epic battles, look for fanfiction that features intense fight scenes between the Straw Hats and powerful enemies. There are also some fanfictions that explore the darker sides of the One Piece world, which can be a fascinating read for those who want something different from the usual light - heartedness of the main series.
The ones that focus on the backstories of minor characters can also be great. They give more depth to the overall One Piece world. Like a fanfic about the early days of Usopp's father Yasopp. It can be really engaging to watch as it fills in the gaps in the official story.
One highly regarded One Piece fanfiction novel is 'The Red-Haired Shanks' Daughter'. It weaves an interesting story around a new character related to Shanks, with great character development and a plot that stays true to the spirit of One Piece. It has exciting action scenes and delves deep into the lore of the One Piece world.
One great One Piece fanfiction is 'The Reincarnated Marine'. It has an interesting plot where the main character is reborn as a marine in the One Piece world and tries to change things from within. The character development is well - done, and it adds new perspectives to the existing One Piece universe.
In the world of One Piece, there's no indication that the characters themselves watch fanfiction. Fanfiction is a creation of the fans in the real world, and the in - universe characters are too busy with their own adventures, like Luffy chasing after the One Piece, Zoro training to be the world's greatest swordsman, and Nami navigating the seas. They don't have access to or knowledge of the fan - made stories about them.
The best One Piece OC fanfiction often has a good integration with the existing One Piece lore. The OC should fit into the world of pirates, devil fruits, and the Grand Line. For instance, if the OC has a devil fruit power, it should be something that makes sense in the context of the already established power system in One Piece. Another aspect is the relationships the OC forms. If they are part of a pirate crew, their interactions with the crewmates should be engaging and add to the overall story.
One highly regarded One Piece fanfiction is 'The Pirate King's Heir'. It has an interesting plot that follows a new character who claims to be related to Gol D. Roger. Another good one is 'Straw Hat's New Adventure' which takes the Straw Hat crew on a different kind of journey not shown in the original manga. 'Ace's Redemption' is also popular as it explores an alternate scenario for Portgas D. Ace.
Some popular platforms for One Piece fanfiction could be FanFiction.net and Archive of Our Own (AO3). FanFiction.net has a large collection of user - generated stories, including many One Piece fanfics. AO3 also has a significant amount of well - categorized fanfiction. They both offer a wide range of interpretations and stories based on the One Piece universe.
I think 'One Piece War of the Best Fanfiction' could center around a war that has the best elements from the One Piece world. It could involve the clash of ideologies among the pirates. For instance, some pirates might be fighting for freedom in a different way compared to Luffy's crew. And there could be a complex plot where different alliances are formed and broken during this war, with the fate of the One Piece world at stake.
One good practice is to find reliable platforms. For example, Archive of Our Own often has a great selection. Another is to read reviews or comments first to gauge the quality. Also, make sure it's in line with the general spirit of One Piece.
One of the great works could be those that explore the backstories of minor characters in more depth. For example, fanfictions that focus on the childhood of Usopp in his village before joining the Straw Hats. They add more layers to the character.