Well, it might change his relationships. For example, with Hinata. If Naruto has Hyuuga blood, their connection could be seen in a different light. Maybe there's some long - lost family connection that is revealed. And within the Hyuuga clan itself, Naruto could face different reactions. Some might be more accepting because of his new - found relation, while others might be suspicious or jealous, especially those who are vying for power within the clan.
One possible storyline could be that Naruto somehow gains a Hyuuga eye through a unique experiment gone wrong. This new power could initially be difficult for him to control, as the Hyuuga eye has its own set of abilities like the Byakugan. He might struggle to adapt to the sudden change in his vision and the new skills it brings, such as seeing the chakra points clearly. This could lead to some comical moments as he accidentally activates the eye at inappropriate times, but also some intense battles where he slowly learns to master this new power and use it in combination with his existing Rasengan and other techniques.
One implication could be a significant power boost for Naruto. Since Kaguya was an extremely powerful being, having her sealed within him might give Naruto access to new levels of chakra and abilities. For example, he could potentially gain more control over space - time ninjutsu, which was Kaguya's specialty. This could make him even more formidable in battles against powerful foes.
One possible reason could be some sort of dark curse or forbidden jutsu. Maybe Naruto was the victim of a malicious experiment that altered his blood composition. Another reason might be related to his connection with a dark entity. For example, if he has some link to an ancient evil, it could manifest in his blood turning black.
One possible plot implication could be that Naruto gains some of Sasuke's abilities or perspectives. Since the Sharingan is a powerful and unique eye in the Naruto universe, Naruto might be able to see things in a different way. For example, he could better understand Sasuke's past actions or motives. Maybe he could also use some of the Sharingan's combat abilities, like predicting enemy movements more accurately, which would change the power dynamics in battles. This could also lead to some interesting character development as Naruto has to deal with these new powers and how they affect his relationships with others, especially Sasuke.
In fanfiction, the seal on Naruto's heart could imply a hidden power source. It might be something that restricts his abilities until he unlocks it, adding an element of mystery and potential for growth. For example, it could be a seal placed by an ancient clan to protect a powerful chakra reserve that only Naruto can access when he overcomes certain trials.
The Juubigan in fanfiction for Naruto often means a shift in the power balance. His relationships with other characters might change too. Allies could be in awe of his new power, while enemies would be more fearful. It also might open up new plotlines like Naruto having to learn to control this new power so as not to accidentally harm his friends.
One implication is that it changes his combat style. He can now use the Sharingan's abilities to predict enemy moves and copy jutsu more effectively. Another is that it might affect his relationships. For example, Sasuke might see him differently. Also, it could lead to new power - up scenarios and different training regimens in the fanfiction.
One implication is that he becomes more powerful. He can move around the battlefield quickly, catching opponents off - guard.
In fanfiction, if Naruto has Jiton, it could potentially change his relationships with other characters. For example, those with an affinity for other elements might view him differently. Also, it can open up new plotlines. He might have to go on a journey to master Jiton fully, which could lead to him encountering new enemies and allies. And it would add a new dimension to his character as he adapts to having this new power.
In fanfiction, if Naruto has the Sharingan, it can change his relationships. He might have a different connection with Sasuke, who is originally associated with the Sharingan. Also, it could lead to new story arcs. For example, he may need to learn how to control this new power, which could involve training with characters like Kakashi who also has the Sharingan. It can also attract the attention of different villains or groups who are interested in the power of the Sharingan.