One possible reason could be extreme stress or trauma. In some fanfictions, Naruto might go through a really tough battle or face a great loss that drains him both physically and mentally. This could potentially cause his hair to turn white, similar to how people in real life can get premature grey hair from high stress.
Maybe the red hair is a result of a genetic experiment or a curse that is linked to the Rinnegan. In the fanfic, it could be explained that an ancient ninja tried to combine the power of the Rinnegan with a powerful fire - type jutsu. The experiment went wrong in a way that gave the character red hair and also altered the Rinnegan's abilities. For example, the Rinnegan might be able to absorb and redirect fire - based attacks more effectively because of this connection.
Perhaps it's a genetic thing that gets triggered later in life. In some fanfictions, Naruto's family history could be rewritten or expanded. There might be some hidden genetic trait from an ancestor that suddenly surfaces, causing his hair to turn red. This could also be linked to a new power or ability that he has to learn to control as his appearance changes.
Maybe they use a hair - growing jutsu on his hair in a really weird way. So his hair starts growing super long and in all different directions. Naruto and Sasuke would do this just to see Itachi's reaction. Itachi, who is always so put - together, would have a hard time dealing with his hair going out of control like that.
Naruto's black hair could play a role in his relationship with Sasuke. Maybe Sasuke has a memory associated with Naruto's black hair from their childhood, like when Naruto was always there for him during tough times. And this memory, triggered by his black hair, could be a turning point in their relationship, leading to a deeper understanding and possible reconciliation.
His long hair might make Sakura see him in a different light. Maybe she starts to notice his more mature side with the long hair and becomes more attracted to him. It could also change his relationship with Sasuke. Sasuke might initially mock his new look but later come to respect the power that seems to be associated with Naruto's long hair.
There's also 'Red - Hair in Konoha'. This fanfic focuses on a red - haired character who comes to Konoha. It delves into the relationships they form with the original Naruto characters, like Naruto himself, Sasuke, and Sakura. The story is full of twists and turns, and the way it weaves the new character into the existing Naruto story is really engaging.
No. In the Naruto universe, Naruto has his own identity as a ninja, and there's no such strange connection to the fire daimyo's hair in the official story or even in most normal fanfictions. Fanfictions usually explore his relationships, adventures, and growth as a ninja, not this kind of absurd concept.
One possibility could be that Naruto's new hair is a result of a powerful jutsu gone wrong. Maybe he was trying to master a new form of transformation and it had an unexpected side - effect on his hair. For example, it could have turned a different color or grown longer in a strange way. This new hair then becomes a symbol of his growth and the risks he takes in his journey to become stronger.
It could be a genetic quirk that was dormant before. In the fanfiction, the author might be exploring a different aspect of the Uzumaki genetics where Naruto inherits his mother's hair later in life for some reason. It could be related to his growth or a new power awakening.