Perhaps the fanfiction focuses on the wanderer's search for the true meaning of immortality. Along the way, he could have deep philosophical discussions with Naruto and other characters about life, death, and the purpose of power.
One interesting plotline could be the immortal wanderer's encounters with different villages in the Naruto world. He might share his unique knowledge and skills, which could change the power dynamics in those villages.
One interesting concept could be Naruto's 'godlike' powers. Maybe he has abilities far beyond his normal ninja skills, like the power to manipulate time or space. This would completely change the dynamics of the Naruto universe and his interactions with other characters.
There could be other characters like Sasuke as well. Sasuke's quest for power and his complex personality might bring him into contact with the immortal wanderer. Maybe he sees the wanderer as a threat or a source of knowledge, which would make their interactions an important part of the fanfiction.
Well, it depends on the specific fanfiction. Some might have Naruto going on new adventures in different lands as a wanderer, facing unique challenges and making new friends or enemies along the way.
One possible plotline could be that Naruto discovers a hidden jutsu or artifact that grants him immortality. He then has to deal with the consequences of living forever, like seeing his friends and loved ones age and die while he remains the same. Another could be that an enemy tries to steal his immortality, leading to a great battle.
One interesting plotline could be the mystery behind the mask. Maybe it has some special power that only Naruto can unlock or it could be related to an ancient prophecy. Another could be a new villain who uses the mask to create chaos in the ninja world and Naruto has to stop him.
Perhaps Naruto discovers a new medical jutsu that combines his chakra control with traditional medical knowledge. This could revolutionize the medical field in the Naruto universe. He might use it to heal previously incurable diseases or injuries, and in the process, gain the respect of the medical community. This could also lead to some interesting interactions with other medical ninja, like Shizune or Tsunade.
Well, in some fanfics, there's a plotline where Hinata loses her memory and Naruto has to make her fall in love with him all over again. It's a classic but still very engaging. There are also stories where they are arranged to be married for political reasons at first, but then they actually fall in love for real during the process. And a really unique one is when Hinata becomes a super powerful ninja overnight and Naruto has to deal with his feelings of being a bit overshadowed while also being proud of her.
One interesting plotline could be Naruto joining the Akatsuki and trying to change it from the inside. He might use his ideals of friendship and peace to influence the other members who have mostly known a life of darkness and violence.
One interesting plotline could be Shizune's involvement in secret medical research within the Hidden Leaf. Maybe she discovers a new form of medical ninjutsu that could change the way they treat serious injuries. Another could be her relationship with Naruto from a medical - training perspective. She helps him understand the importance of medical skills for a ninja, and they bond over that.
One plotline could be Scathach training Naruto in some ancient and powerful techniques that are not known in the ninja world. This would give Naruto an edge over his enemies and also lead to interesting interactions between them as Naruto tries to master these new skills.