A plot could involve a group of rogue ninjas who find a way to summon an Altera - like entity. This entity starts causing chaos in the ninja world by disrupting the natural flow of chakra. The main characters then have to find a way to stop it, which might involve learning about ancient sealing techniques that were once used to deal with similar threats. It could also lead to the discovery of a hidden connection between the Naruto world and the realm from which Alteras originate.
Perhaps an Altera - inspired character arrives in the Naruto world seeking a powerful chakra source. This character believes that the tailed beasts' chakra can be used to power up their own abilities or to complete a certain ritual. The Naruto characters initially view this newcomer as a threat but later realize that they might need to work together to prevent a greater evil from being unleashed. This could involve the exploration of different cultures and powers within the Naruto universe as they try to understand the motives of the Altera - inspired character.
A simple plot could be that Ruby is a foreign ninja who comes to the Leaf Village seeking asylum. She has a special ability to control plants, which is unheard of in the Naruto world. The Leaf Village ninja are initially suspicious of her but as they get to know her, they realize she can be an asset. Together with Naruto, they face off against an enemy who is using dark magic to wither all the plants in the land, and Ruby's powers are crucial in reversing this.
An interesting plot idea for Naruto fanfic might be to focus on the life of a minor character. For instance, what if we told the story of a genin who never made it to be a chunin but still had a significant impact on the village in some other way? Or a story where all the ninja abilities are suddenly switched among the characters, and they have to adapt to these new powers while still facing their usual enemies. This could lead to some really fun and unexpected character interactions.
The Phoenix bloodline might also have a connection to the afterlife. A character with this bloodline could communicate with the spirits of the dead. This could lead to interesting storylines where they seek advice from past Hokages or learn secrets about the ninja world from the spirits.
One idea could be a character with the butterfly bloodline being an outcast in the Hidden Leaf Village at first. Because their abilities seem so strange compared to the common ninja skills. As the story progresses, they prove their worth during a big battle against an invading force. Their butterfly - like wings can be used for both quick evasion and powerful wind - based attacks.
Perhaps a plot where Kushina is brought to the Fairy Tail world where Erza is from. Naruto, who has some connection to this strange event, follows. Erza takes Kushina under her wing, teaching her about the magic in this world. Naruto tries to adapt and in the process, he and Erza form a unique friendship. They then have to face a great threat in the Fairy Tail world together with Kushina's new - found magic skills.
One idea could be a story where Kushina comes back to life briefly and shares her old stories with Naruto and Tsunade. This could include tales of her time as a kunoichi and how she met Minato. Another plot could be a training arc where Tsunade trains Naruto in a special medical - ninjutsu technique that was once known to Kushina.
One way is to create a new jutsu or power system inspired by Altera. For example, a character could possess an ability similar to Altera's that allows them to manipulate space or time in unique ways within the Naruto universe. Another option is to introduce an Alter - like character who has different values and goals compared to the regular Naruto characters and causes some sort of disruption or change in the story's dynamics.
The stranger could be a time - traveler. In the Naruto world, the time - traveler stranger could go back in time to prevent the Uchiha massacre. This would have a huge impact on Naruto's story as Sasuke's path would be completely different. Then, in the Bleach world, the stranger could travel to the past to stop the initial Hollowfication of White, which was the start of many problems in that universe. This would change the relationships between characters like Ichigo and his Hollow side.
One plot idea could be a training adventure. Naruto teams up with Anko, Kurenai, and Yugao for a special mission that requires all their skills. They go to a mysterious forest where they encounter strange creatures. Along the way, Anko's wild nature clashes with Kurenai's more calm and collected approach, while Yugao tries to keep the peace. Naruto, of course, is eager to prove himself and learns a lot from the three female ninja.
One plot idea could be that the Sannin discover a prophecy that only Naruto, Sasuke, and Sakura can fulfill. So they take the three under their wings more intensively. Jiraiya focuses on Naruto's spiritual growth, Orochimaru on Sasuke's control over his dark powers, and Tsunade on Sakura's physical and mental strength. As they train, they also uncover secrets about the ninja world that could change everything.