I think Nami would be a very interesting character in this fanfiction. She's smart and resourceful. In a time - travel scenario, she could use her knowledge of navigation and her wits to figure out how to get the crew back to their own time. Also, she might be able to take advantage of the economic situations in different time periods to amass wealth for the crew in ways she couldn't in the original story.
I think Zoro would be really interesting to time travel. He has a strong sense of honor and his swordsmanship skills are top - notch. If he traveled to the past, he could learn from the greatest swordsmen of that era and bring back ancient sword techniques to the present. In the future, he could see how swordsmanship has evolved and maybe even find a way to further enhance his own skills.
In 'One Piece Time Travel Crew Fanfiction', a great concept is seeing how the time - traveling crew influences the future they come from. They might do things in the past that unknowingly set in motion events that change their original present. For instance, they could inspire a young character to become a great pirate earlier than in the original timeline. This could lead to a completely different power dynamic among the pirates and the Marines, and also change the way the Straw Hat crew's adventures unfold in the future.
Luffy would be really interesting. His carefree and adventurous nature would make his reactions to different time periods really fun to explore. He might try to befriend everyone he meets in the past or future, regardless of the consequences. His simple view of things could also lead to some unexpected changes in the timeline. For example, he might accidentally start a new pirate crew in the past or inspire a revolution in the future just by being himself.
One possibility is that the OC son could be on a journey to discover his father's past. He might face many challenges as he tries to live up to the legacy of the Roger Crew. For example, he could encounter enemies who were once foes of the Roger Crew and they target him because of his relation. Maybe he also has some special abilities or knowledge passed down from his father which he uses to fight and survive in the dangerous One Piece world.
I think Luffy and Whitebeard himself would be the most interesting. Whitebeard is a legendary figure. Luffy would be eager to prove himself in front of him. And Whitebeard would see the potential in Luffy. Their exchange could be filled with wisdom from Whitebeard and Luffy's naive yet charming responses.
Kazama Chikage might be an interesting choice as well. He is a powerful and somewhat arrogant character. If he time - travels, perhaps to a past era where his clan was even more powerful, he could try to change history to make his clan even more dominant. Or if he travels to a future where his power is nothing compared to modern technology, his struggle to come to terms with his new position in the world would be an interesting plotline.
Iroh would be fascinating to see time - traveling. He has so much wisdom already. If he traveled to different times, he could share his knowledge and perhaps change some key events. He could also gain more insights from other time periods, which would further enrich his already deep understanding of the world.
Definitely Batman and Luffy. Luffy's carefree and positive attitude would contrast with Batman's brooding nature. But they both have a strong sense of justice. Luffy punches bad guys, and Batman uses his gadgets and martial arts. They could learn a lot from each other. Another interesting pair could be Robin and Alfred. Alfred's wisdom and knowledge could help Robin understand more about the history and culture in Batman's world, while Robin could share her knowledge of the Poneglyphs with Alfred.
I think Nami could be fascinating. In a DxD setting, she could use her wits and charm to manipulate some of the Devils and Angels, just like she does with pirates in One Piece. Also, her knowledge of navigation and treasure hunting could give her a unique role in the DxD universe, perhaps leading her to discover some hidden treasures related to the different factions.
One Piece's time-travel novel was a type of fictional novel that usually described how the protagonist transmigrated to One Piece's world to change the course of history and the world's structure through adventures and battles. In One Piece's world, the protagonist would usually encounter various mysterious characters and powerful enemies, as well as many touching storylines. This kind of novel format usually has many elements such as fantasy, adventure, and friendship to attract readers 'interest. If you wanted to write a time travel novel about One Piece, you would first need to understand One Piece's worldview, characters, and storyline. Then, you would need to construct the main character's image and storyline according to your own ideas. Finally, you would need to conceive and write.