One idea could be that Tenten becomes yandere for Naruto after he saves her life in a battle. She then starts to secretly eliminate any girl she sees as a threat to her 'relationship' with Naruto. For example, she might try to sabotage Hinata's attempts to talk to Naruto.
A different plot idea is that a genjutsu is cast on Tenten which makes her yandere for Naruto. Naruto is oblivious at first, but as Tenten's actions become more extreme, like stalking him and getting aggressive with his friends who are too close to him, he has to figure out what's wrong and break the genjutsu.
Naruto might be really confused at first. He's used to people being friendly or having normal crushes, but a yandere is a whole different level. He'd probably try to talk to her and understand why she's acting so strangely.
One idea could be that Naruto and Tenten are banished due to a false accusation of plotting against the village. They then have to prove their innocence while on the run. They might encounter old enemies who have also been exiled and form an unlikely alliance to clear their names.
One idea could be a story where Naruto, Hinata, and Tenten go on a mission together. They face a powerful enemy and have to rely on each other's skills. Naruto uses his Rasengan, Hinata her Gentle Fist, and Tenten her weaponry skills. Another plot could be a time - travel story where they go back in time and have to change an important event in the ninja world. It could be something related to the founding of their villages.
One idea could be a mission where Naruto, Temari and Tenten are teamed up. They have to retrieve a powerful and ancient scroll from a hidden temple. Along the way, Naruto's determination and positive attitude inspire Temari and Tenten. Tenten shows off her weapon skills, and Temari uses her wind jutsu to clear obstacles. They face various traps and enemies, and in the end, they bond over their shared success and newfound respect for each other.
One idea could be that Sakura's yandere tendencies lead her to try and isolate Naruto from his other friends. She might start by spreading rumors about them to Naruto, causing some initial confusion and rifts in his relationships.
One idea could be that Naruto and Tenten travel back to the founding of Konoha. They could use their modern - day knowledge and skills to influence the early development of the village in positive ways, like introducing new training methods. Another plot could involve them going back to a time when a great enemy first emerged, and they have to find a way to stop the threat before it becomes too powerful.
A possible plot could be a story set in an alternate universe. Naruto is not the hero he is in the original story, but Hinata and Tenten believe in his potential. They work together to help Naruto find his true self and his powers. Along the way, they encounter old enemies who are now much more powerful, but through their combined efforts and friendship, they manage to grow stronger and face the challenges.
Another plot idea is that they explore their family history together. Since Naruto has always been an orphan and Tenten's family background isn't explored much in the original series, they could embark on a journey to find out more about their parents. Along the way, they would face many obstacles and meet various characters who either help or hinder their search, all while growing closer as siblings.
A plot idea might be that Sasuke, in his yandere state, secretly follows Naruto everywhere. He then starts to eliminate any potential danger to Naruto, even if Naruto doesn't see it as danger. For example, if a merchant is a bit rude to Naruto, Sasuke might find a way to drive the merchant out of the village. Also, Sasuke could be very controlling about Naruto's missions, trying to ensure that he's always by Naruto's side during them.
One plot idea could be that Yandere Ino becomes overly possessive of Naruto when she sees him getting close to other female characters. She starts to secretly sabotage his friendships with them, like spreading false rumors. Another could be that Yandere Ino tries to use her mind - transfer jutsu on Naruto to make him fall in love with her. And a third idea is that Naruto initially doesn't understand Yandere Ino's extreme behavior until it starts to put him and his friends in danger.