One idea could be that Naruto's blue hair is a sign of a new, powerful chakra form. He has to learn to control it while his friends are both amazed and a bit scared. For example, Sasuke might initially see it as a threat to his own power.
A fun plot could be that Naruto wakes up one day with blue hair due to a strange experiment gone wrong by a mad scientist in the Hidden Leaf Village. His new look makes him stand out even more, and he uses it to his advantage to play pranks on his friends, but then it also attracts the attention of some dangerous enemies who want to use him for their own purposes.
Perhaps in this fanfiction, Naruto's blue hair is the result of a curse placed on him by an ancient enemy. He then has to go on a journey to find a way to break the curse, facing many challenges along the way, like dealing with villagers who fear his new appearance.
One plot idea could be that the girl with blue hair discovers she has a special power related to water because of her hair color. For example, she can control the flow of water in rivers or make it rain in a drought - stricken area. Another idea is that she comes from a different dimension where blue - haired people are the rulers, and she's on a mission to find a way to bring peace between her dimension and ours. Maybe she meets a boy who at first is scared of her because of her unique appearance but then they become friends and he helps her in her mission.
A possible plot in a Naruto with long hair fanfiction could be that he's on a mission in a far - off land where having long hair is a sign of great power. Naruto, being Naruto, decides to grow his hair long to blend in and gain the respect of the locals. As he does this, he discovers new fighting styles that are based around using his long hair as a weapon or a tool. Another interesting plot could be that Naruto's long hair is a result of a curse placed on him by an enemy. He has to find a way to break the curse, but in the process, he realizes that the long hair also gives him some unexpected advantages in combat. For example, he can use it to sense the movements of opponents or to distract them during a fight.
Maybe Naruto's new hair is the result of a cross - dimensional encounter. He accidentally travels to a parallel world where all the characters have different hair styles. When he returns to his own world, his hair has changed to a style that combines elements from both worlds. This new hair then becomes a link between the two dimensions, and he has to use it to prevent a threat that is spreading across both universes.
One idea could be a story where Naruto has an orange - haired relative who comes to the village. This relative has a unique jutsu that only the orange - haired members of their family can use. Another plot could be about an orange - haired character who is a big fan of Naruto and tries to follow in his footsteps, facing many challenges along the way. And a third plot might be a time - travel story where Naruto meets an orange - haired version of himself from an alternate dimension.
One idea could be that Naruto, with long hair, discovers a new form of chakra that is only accessible when his hair is long. This new power could lead to him having to master new techniques and face different challenges. For example, he might have to learn how to control his hair during battles so it doesn't get in the way of his movements while still being able to use it as a weapon or a tool for his new chakra - based abilities.
One plot idea could be that Naruto, with his immortality, somehow gets transported to the world of Blue Exorcist. He teams up with Rin and the others to fight a new kind of demon that is threatening both their worlds. His ninja skills combined with the exorcist powers would make for an exciting adventure.
A third plot idea is that some of the characters from Blue Exorcist end up in the Naruto universe. Rin and his friends could be intrigued by the concept of ninjas and chakra. They might learn some ninja techniques and in turn, teach the ninja about exorcism. This could lead to a new generation of ninja - exorcists in the Naruto world. They could also help the ninja deal with a dark force that has some similarities to demons from their own world.
One plot idea could be that as a girl, Naruto faces different challenges in the ninja academy. Instead of the typical male bravado, she might use her wits and charm more. For example, she could befriend Ino and Sakura in a different way, perhaps forming a more united girl - power trio against the boys. Another idea is that her red hair makes her stand out even more in the Hidden Leaf Village, leading to some superstitions or special expectations from the villagers. Maybe she's seen as a symbol of change or something new in the village's future.
Another plot could involve Snape having his hair in a ponytail during a time - traveling adventure. He travels back to his own school days, and his ponytail becomes a sort of symbol of his future self. He has to interact with his younger self and other characters while sporting this new - look ponytail, which causes all sorts of interesting reactions.
One idea could be a crossover where Naruto characters end up in the world of Blue Exorcist. For example, Naruto and his friends could be mistaken for exorcists and get involved in battles against demons. Another idea is to create an alternate universe where the main characters of Blue Exorcist have the powers of Naruto characters. Maybe Rin could have the Nine - Tails' chakra and have to learn to control it like Naruto did.