Maybe there are some shadowy figures from Robin's past who resurface because of Luffy's new power. These antagonists could be related to the organization that hunted Robin before. They fear that with Luffy by her side and being so powerful, she will finally be able to expose their secrets and bring them down. So they try to stop Luffy and Robin at all costs.
There's also a fanfiction where Luffy time travels to the past and meets Gol D. Roger. In this one, Luffy's overpowered nature completely shocks Roger and his crew. Luffy ends up sharing some of his future experiences which has a profound impact on how Roger views the future of the world. It's an interesting take on how time travel could change the One Piece lore.
One interesting overpowered Luffy fanfiction could be the one where he has the ability to control all types of Haki from the very beginning and uses it to take on the toughest foes in the New World without much struggle. Another might be a story where he has a unique devil fruit power in addition to the Gum - Gum fruit, like the power to manipulate time for a short period, which gives him an edge in battles.
One interesting plot could be Luffy's newfound overpowered abilities helping him save Robin from extremely dangerous situations in a more spectacular way than in the original story. For example, he might be able to single - handedly take on an entire fleet of powerful enemies to rescue Robin.
The idea of an overpowered Luffy in a time travel scenario is appealing because it breaks the normal boundaries of the One Piece story. We get to see Luffy use his powers in new and unexpected ways. For example, he can use his future knowledge to avoid mistakes or defeat enemies more easily.
You can start by looking on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. They have a wide range of One Piece fanfictions, including ones with an overpowered Luffy. Just search for 'overpowered Luffy' in the search bar, and you'll get a list of relevant stories.
Well, it really depends on the specific fanfiction. Some fanfictions do make Ichigo overpowered. They might do this to explore different storylines or just for the fun of it. For example, in some, he could have a sudden boost in his reiatsu that makes him almost unbeatable. But not all fanfictions take this route. There are also those that focus on his character development in a more realistic way within the context of the Bleach universe and don't make him overly powerful.
Maybe it has the ability to absorb chakra. So when Naruto is in a fight against an opponent with a large amount of chakra, he can use the sword to drain some of that chakra, weakening the enemy while strengthening himself. The sword could then store that chakra for later use, like to boost Naruto's own attacks.
It could be a sword that can cut through any substance, like the Susanoo easily. Just imagine Naruto swinging it and slicing through powerful jutsu defenses as if they were paper.
One possible aspect to consider in 'natsu overpowered fanfiction' is how it changes the power dynamics within the original story's universe. If Natsu is made overpowered, it can lead to different plot developments. For example, battles that were originally challenging might become one - sided, which could either make the story more exciting as we see Natsu's dominance or less engaging if the conflict is too easily resolved. Also, it might affect the relationships between characters. Other characters may start to view Natsu differently, either with awe or envy. This can create new story arcs centered around these changed relationships.