Perhaps Naruto travels to a dimension where everyone has a unique animal spirit companion. He has to bond with one of these spirits to gain access to certain powers. This would be a whole new experience for him as he's used to his own ninja world and its rules.
One interesting plot could be Naruto visiting ancient ninja clans in different parts of the world and learning their unique jutsu. For example, he might discover a clan in a far - off land that has a special water - based jutsu that he can adapt to his own fighting style.
One possibility is that Naruto and Naruko are on a mission to save the multiverse in this fanfiction. They travel through dimensions to collect some special artifacts or powers that are scattered across different realities. Along the way, they might face challenges from the rulers of those dimensions who don't want them to take those things. This could involve epic battles and the forging of new alliances as they strive to complete their mission.
One interesting plot could be Naruto using his future knowledge to prevent the Uchiha massacre. He might try to change Itachi's situation and find a way to resolve the conflict between the Uchiha clan and the village without all that bloodshed.
He often meets versions of himself from different dimensions. These other Narutos might have different personalities or abilities due to the differences in their respective dimensions.
Well, a really cool plot could be that Harry travels to a dimension where the wizarding world is merged with the Muggle world in a very chaotic way. He has to figure out how to keep the balance. Also, he might end up in a dimension where the Marauders are still alive and he gets to interact with them, which would be a great story of friendship and adventure. And there could be a dimension where magic is based on emotions and Harry has to learn to control his feelings to use magic effectively.
It could be some powerful dimension - hopping villains who want to use the power of different dimensions for their own evil purposes. They might see Naruto and Naruko as threats to their plans.
In this type of fanfiction, a great plot could be that Sakura and Sasuke are on a journey to find a cure for a strange illness that is affecting the ninja world. Along the way, they face many challenges. They might have to deal with enemy ninjas who want to stop them because they fear the power the cure could bring. Their relationship also evolves during this journey, as they rely on each other more and more, and Sakura's strength and Sasuke's cold exterior start to change as they get closer to their goal.
Well, one possible plot could be that they embark on a journey to discover a rare Pokémon. Along the way, they face various challenges like rough terrains and strong wild Pokémon. This tests their skills and friendship.
In this type of fanfiction, a cool plot could be Harry traveling back to the time when the founders of Hogwarts were alive. He could learn ancient magic directly from them. He might also get involved in the politics of that time, helping to shape Hogwarts' early rules and traditions. This would not only change his own future but also the future of the entire wizarding world as he brings back forgotten knowledge and wisdom from the past.
One idea could be Naruto traveling to a dimension where ninjutsu doesn't exist, and he has to rely solely on his physical strength and strategic thinking to survive. Another could be a dimension filled with powerful, ancient beasts that Naruto must befriend or defeat. Maybe he travels to a dimension where everyone has a unique kekkei genkai that he has to learn to co - exist with.