One interesting plot could be that Naruto forgets all his ninja skills. His friends then have to reteach him everything from the basics. For example, Sasuke might take on the role of a strict teacher, which would be a big change in their relationship.
In some fanfictions, Naruto might get amnesia due to a powerful enemy's jutsu. His amnesia could be selective, only forgetting his time as a hero. This would make the village see him in a different light. Some might suspect him of faking it, while others would be more sympathetic, trying to help him regain his true self.
One interesting plot could be Sonic forgetting who his friends are. His friends then have to re - introduce themselves and remind him of all the good times they've had together. For example, Tails could show Sonic their workshop and all the inventions they made together, gradually triggering Sonic's memories.
One interesting plot could be that Naruto is adopted by a powerful and kind shinobi from another village. This new family could teach Naruto different jutsu and a new way of life, changing his perspective on the ninja world. For example, if he's adopted by a Waterfall Village shinobi, he might learn their unique water - based techniques.
In some fanfictions, Naruto is brainwashed to believe he is from another village. So he starts working for their goals. This could lead to a lot of interesting interactions as he clashes with his former comrades. The story might explore how he slowly starts to remember his true identity through small flashbacks and the bonds he has with his friends.
One interesting plot could be Naruto using the Rinnegan's powers in unique ways during battles. For example, he might combine the Rasengan with the Deva Path's ability to attract and repel, creating a new and powerful attack.
One plot could be Naruto getting a mysterious illness that no one in the village can figure out. His friends, like Sakura and Sasuke, start to search for a cure. They might go on a journey to find a rare herb or seek the help of an old sage. Another could be that the illness is a result of a new enemy's jutsu. As he gets sicker, the village starts to worry about their future without their hero.
One possible plot could be Naruto going on a journey to prove his worth after being banished. He might encounter new allies and enemies, and develop new jutsu.
Well, in some Naruto gets magic fanfiction plots, Naruto might be given a magic item like a ring that allows him to communicate with spirits. These spirits could then guide him in battles and give him advice on how to defeat his foes. Another interesting plot could be that Naruto is transported to a world full of magic, and he has to adapt quickly. He might learn magic spells that enhance his speed and strength. Also, he could meet new characters who are masters of magic and they could teach him how to use magic in combination with his ninja skills.
One possible plot could be that Naruto's friends have to take on his missions while he is sick. They struggle at first because they realize how much Naruto usually does. Another could be that Naruto tries to hide his sickness from everyone, but his body keeps giving him away, like fainting during training. And a third plot might be that a new enemy takes advantage of Naruto's weakened state to attack the village.
Well, in some fanfictions, Naruto gets controlled by a mind - altering device created by a rogue scientist from another village. This device makes Naruto do things that are out of character, like stealing important ninja scrolls. His friends initially suspect he has turned bad, but then they discover the truth and have to race against time to remove the device. Also, there could be a plot where Naruto is controlled by a powerful genjutsu cast by a long - lost relative who has a vendetta against the village and wants to use Naruto as a weapon to get revenge.
A common plot is the struggle of his friends to make Hiccup remember who he is. They might show him his old inventions or take him to places that hold special memories. Another plot is Hiccup having to relearn dragon training from scratch, which is interesting as he has to rediscover his own skills. And often, there's a plotline about his relationship with Astrid being put to the test since he doesn't remember their history.