One idea could be that Ichigo and Naruto are transported to a strange new dimension where they have to work together to find their way back home. They start by comparing their skills and learning from each other. For example, Naruto could teach Ichigo some of his shadow clone techniques, while Ichigo shows Naruto how to use his zanpakuto more effectively.
Another plot could be that Ichigo accidentally ends up in the Naruto universe during one of his battles. Naruto mistakes him for an enemy at first, but after a short skirmish, they realize they are both on the same side. They then embark on a journey to help Naruto's village with a problem, like a new type of demon that neither of them has faced before. Along the way, they become great friends and exchange stories about their respective friends and families.
Maybe there's a powerful villain who is causing chaos in both their worlds simultaneously. Ichigo and Naruto meet and realize they need to combine their powers to defeat this common enemy. They could have a bit of a cultural clash at first, with Ichigo being more reserved and Naruto being so outspoken, but eventually they bond over their shared goal of protecting their loved ones and their worlds.
One possible plot idea could be that Ichigo and Rias team up to fight a common enemy that threatens both their worlds. Maybe a powerful dark force that neither of their usual allies can handle alone.
Maybe in the fanfiction, Ichigo and Naruto meet during a tournament held in a world that combines the elements of their respective universes. They start as rivals but soon realize they have more in common and end up fighting together against those who want to disrupt the tournament for their own evil purposes. This could involve them combining their unique powers like Ichigo's Getsuga Tensho and Naruto's Rasengan in creative ways.
Maybe fem Ichigo has a different set of powers compared to Ichigo. In the fanfiction, they could train together to combine their powers in a unique way. For example, her powers might be more focused on defense while Ichigo's are on offense, and they learn to complement each other. This could lead to some interesting character development as they overcome their differences and work towards a common goal.
One idea could be that Noodlehammer Naruto has some unique jutsu related to his 'noodlehammer' concept that he teaches to the original Naruto. This could lead to new ways of fighting enemies in the Naruto world. Another plot could involve them teaming up to face a powerful new villain who is immune to normal ninja techniques but is vulnerable to the strange powers of Noodlehammer Naruto.
One idea could be Boruto getting transported back in time and meeting a young Naruto. He could then help Naruto avoid some of the early hardships he faced, but also realizes that those hardships made Naruto who he is. Another could be Naruto and Boruto switching bodies for a day, which would lead to humorous situations as they try to navigate each other's lives. A third idea might be that Boruto discovers a hidden power within himself by training with Naruto in a special dimension where time moves differently.
In some fanfictions, they could meet during a time - travel incident. Naruto from the present meets Naruko from the past or vice versa. They then exchange knowledge about the future or past events, which changes the course of their own timelines. This could lead to some really interesting character development as they both try to adapt to the new information and how it affects their relationships with their friends and family.
Maybe Kagome is mistaken for a new ninja from a far - off land. She has to quickly learn the ways of the ninja while also trying to find a way to return to her own time. Naruto could be the one to help her adapt and in the process they learn from each other's unique abilities.
In some fanfictions, they meet in a situation where Sasuke has lost his memory. Naruto then takes it upon himself to help Sasuke regain his memories and in the process, they go on various adventures together, facing different challenges that test their bond all over again.
One plot idea could be that Ichigo, with his unique powers, gets transported to the Naruto world. The girls in Naruto's world are intrigued by his different abilities and his cool demeanor. For example, Sakura might be interested in his healing powers which are different from the medical ninjutsu she knows. Another could be a tournament where Ichigo has to fight using Naruto - style combat and in the process, he catches the eye of the female ninjas. They start to form a sort of harem around him as they want to learn from him and befriend him.
Perhaps Byakuya loses his powers and Ichigo has to help him regain them. This role - reversal would be very interesting as Ichigo becomes the teacher and Byakuya the student. They would have to work together in a whole new way, and Ichigo would have to prove himself to Byakuya in a different context.