One possible storyline is Naruto joining Fairy Tail and using his immortality to protect the guild from powerful enemies. He could take on dangerous missions without the fear of death. Another could be that he tries to find a way to reverse his immortality because he misses the normal cycle of life and death. Or perhaps he becomes a mentor to the younger Fairy Tail members, teaching them his ninja wisdom along with his unique immortality - related skills.
Naruto's chakra could be seen as a form of magic in the Fairy Tail world. His ability to use Shadow Clones, for instance, could be combined with a Fairy Tail mage's illusion magic. He could create dozens of clones that are also capable of casting illusions, confusing enemies. His Rasengan could be enhanced with different types of magic, like wind magic to make it even more powerful and destructive.
There are likely fanfictions where Naruto's immortality in the Fairy Tail setting gives him unique powers. For example, he might be able to combine his ninja skills with Fairy Tail magic in ways that no one else can. His immortality could also mean he has an infinite amount of time to master different types of magic, making him an extremely powerful and feared figure in the Fairy Tail world.
Well, in some fanfictions, the immortality aspect might lead to really cool plotlines. Imagine Naruto characters like Sasuke or Kakashi becoming immortal and interacting with Fairy Tail's immortal characters like Zeref. They could exchange knowledge about their different forms of power and how to control their newfound immortality. Also, the guilds in Fairy Tail and the ninja villages in Naruto could form alliances based on this new shared situation of having immortal members.
There's also 'Immortal Bonds in Naruto - Fairy Tail'. This fanfic focuses on the idea of how characters from Naruto and Fairy Tail form unbreakable bonds while dealing with a threat that can only be faced with the combined powers of immortality, ninjutsu and magic. It delves deep into the character development of both universes' characters.
One way for Naruto characters to become immortal in fanfiction is by delving into the secrets of the Sage of Six Paths. Maybe there is a hidden aspect of his power that can grant immortality. In Fairy Tail, characters could use powerful lost magics. There might be a long - forgotten magic spell that, when cast correctly, can make a mage immortal. They could discover this magic in an ancient, hidden library or from a very old and wise wizard.
One good example could be a story where Naruto's chakra and Fairy Tail's magic are combined in an immortal realm. For instance, Naruto might use his shadow clones in a unique way in the Fairy Tail world, and the immortal aspect could be added by making the characters face challenges that require them to gain some form of immortality. Maybe they have to defeat an ancient evil that has the power of immortality, and in the process, they discover new abilities within themselves.
In this type of fanfiction, it often combines the unique elements from Naruto and Fairy Tail. The concept of an immortal Juubi Naruto in a Fairy Tail - like world could lead to some really exciting storylines. For example, Naruto's powerful abilities combined with the magic - filled world of Fairy Tail might create new forms of combat and friendships. The immortal aspect could also mean he has to deal with the passage of time differently, seeing friends come and go while he remains unchanged.
The most interesting aspects? Well, for starters, Naruto's immortality allows for long - term character development in the Fairy Tail setting. He can build relationships over a long period, like befriending Natsu and the others. His unique abilities like shadow clones could be combined with magic in unexpected ways. Also, his backstory as an outcast in his own world and then coming into a new world as an immortal could lead to some deep exploration of his character and how he adapts, which is really fascinating.
Well, in such a fanfiction, the storyline might develop with Naruto's immortality bringing new challenges to the Fairy Tail world. Maybe he has to deal with dark guilds in a different way because he can't be killed easily. His ninja skills could also blend with the magic in Fairy Tail, creating unique combat styles.