One Piece was a very famous manga with many important characters. The following is a brief introduction of some of the main characters:
1 Monkey D Luffy
Luffy was the protagonist of One Piece. He was a young man who dreamed of becoming One Piece. He had a strong will and a strong belief to fight and take risks in order to achieve his dreams.
2 Nami
Nami was a sailor with excellent sailing and painting skills. She had a gentle personality and a strong sense of justice. She always fought to protect Luffy and others.
3 Usopp
Usopp was a brave pirate. Although he had a quiet personality, his heart was filled with courage and a sense of justice. In order to protect himself and Luffy, he constantly fought and took risks.
4 Sanji
Sanji was a superb chef and also had excellent combat skills. He had a gentle personality and a firm belief. He worked hard and struggled to achieve his dreams.
5 Choba (Chopper)
Choba was a reindeer with magical reindeer abilities. Although he was small in size, he had very strong combat ability and agility. He had a cute personality and a kind heart.
6 Rorono Zoro
Sauron was a powerful swordsman with strong beliefs and powerful combat skills. He worked hard to become the Pirate King and became good friends with Luffy.
7 Very Fair (Remington)
Shinhei was a mysterious pirate who had the ability to stop time. He had a calm personality and noble moral character. He fought to protect Luffy and the others.
In this fanfiction, Ace, Luffy and Sabo could have a future in Marineford that is full of hope. Maybe they work together to change the perception of pirates in that place. Ace could use his fire power to protect the weak, Luffy with his unwavering will continues to inspire others, and Sabo with his intelligence devises plans to make Marineford a more inclusive place for both pirates and marines.
Pica was one of the top officers in the Donquixote Pirates. He had the ability to merge with stone, which was a very unique power. His back story is somewhat related to his loyalty to Doflamingo. He was likely inspired by Doflamingo's charisma and strength, and thus became one of his most trusted subordinates. He followed Doflamingo's orders without question, believing in Doflamingo's grand plans for the New World.
Well, it's a wild concept. They might use their future knowledge to help save some characters or cause chaos with their modern skills and perspectives. There are endless possibilities for how the story could unfold.
Naruto's shadow clone jutsu could be used in a similar way as in his own world. He could send clones to gather information about the situation at Marineford, like where Ace is held and what the Marines' plans are. His rasengan could be a powerful attack against the Marines. Maybe in the One Piece world, it could be seen as a type of 'haki - infused' attack since haki is the main power source there.
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.
A leaf knowing autumn, literally, meant that one could know the arrival of autumn from the fall of a leaf. It was often used to describe how one could see the development trend and outcome of the entire situation through individual subtle signs.
In reference material 2, it was mentioned that the Chinese people had gained insight into the wisdom of "knowing autumn with a leaf" 2,000 years ago. It could also be understood as predicting the development trend or outcome of things through some small changes or signs.
In reference 3,"One Leaf Knows Autumn" was interpreted as knowing that autumn had arrived when one saw a fallen leaf. It was a metaphor for predicting the development trend of things from subtle signs.
In reference 5," One Leaf Knows Autumn " meant that one knew the arrival of autumn from the fall of a leaf. The metaphor was that one could see the development trend and outcome of the entire situation through individual subtle signs. It could be used to describe a person who had extremely high insight in their professional field.
While waiting for the anime, you can also click on the link below to read the classic original work of " Full-time Expert "!
The 'Gears of War' series by Karen Traviss does a great job of explaining the story. It delves deep into the lore, characters, and the overall world of Gears of War.
It's hard to say for sure without reading it, but it could include the main characters from One Piece like Luffy, Zoro, and Nami. Maybe some new characters created by the fanfic writer as well.