The plot could involve Naruto being resurrected as a vampire by some dark magic. As a vampire, he is shunned by some in the village at first. But then he discovers that there are other vampires who are planning to take over the ninja world. So he teams up with his old comrades, using his unique combination of ninja skills and vampire abilities to stop them.
One possible plot could be that Naruto dies heroically in a final battle against a powerful enemy. As a ghost, he discovers that there are unresolved issues in the Hidden Leaf Village. He then tries to communicate with his friends like Sasuke and Sakura, but they can't see him at first. Eventually, he finds a way to make his presence known and helps them solve a mystery that was related to an old enemy's plot that was still endangering the village even after his death.
Another idea is that Percy discovers he has a long - lost vampire heritage. As he becomes a vampire, he starts to unlock memories and powers related to his vampire lineage. He could go on a journey to find out more about his vampire ancestors and the secrets they held, all while adjusting to his new vampiric existence which is full of both challenges and newfound abilities.
Maybe Alvin gets bitten by a vampire one night while walking alone. Then he starts to experience the changes like craving blood and having enhanced senses. He could struggle to come to terms with his new identity as a vampire.
One possible plot could be that Naruto, after dying heroically in his own world, is sent to the Soul Society. There, he discovers his new spiritual powers as a Soul Reaper. He might struggle at first to adapt to the new rules and hierarchy. He could meet old friends in spirit form and together they train to become strong Soul Reapers. Naruto's determination and unique ninja skills might give him an edge in this new afterlife, and he could end up facing some great evil in the Soul Society, using his newfound powers in unexpected ways.
In this fanfiction, Naruto's death could be a sacrifice. As a hollow, he could start off being very confused. His ninja skills might be warped in this new form. For example, his Rasengan could turn into some sort of dark energy blast. He might also meet other characters from the Naruto world who have also had strange after - deaths, and together they try to find a way to either move on or return to their normal state.
His relationship with Sakura would be very different. Instead of the old friendship/romantic tension, Sakura might be initially afraid of him as a vampire. She would have to overcome her fear and see that Naruto is still the same person inside. His relationship with Sasuke could also be strained. Sasuke might see Naruto's transformation as a sign of weakness or a new threat.
Perhaps there's a prophecy involved. The fanfic could be set up where it's foretold that Boruto will bring about a great change, but only if he survives a certain threat. Naruto, aware of this, sacrifices himself to ensure Boruto lives on. This could then trigger a series of events where Boruto has to deal with the political fallout in the village, as some may blame him for Naruto's death, while others see him as the key to the future. It could also lead to a rift between Boruto and some of his friends who struggle to understand why Naruto had to die for him.
One possible plot could be that Naruto is poisoned by a Christmas - themed gift that was actually a trap set by an old enemy. As he slowly succumbs to the poison on Christmas, he reflects on his life and his friends. His friends gather around him, trying to find a cure, but it's too late, and he passes away, bringing a somber mood to the usually festive Christmas in the Hidden Leaf Village.
In the 'naruto dies boruto fanfic', it could be that Naruto is killed by an unexpected betrayal within the village. This shatters Boruto's world. He then goes on a journey to find out the truth behind the betrayal. Along the way, he meets some of Naruto's old friends who help him train and grow stronger. Boruto also starts to uncover secrets about the village's past that his father was trying to protect, and he realizes he has to be the one to expose these secrets and bring justice to his father's death.
Perhaps Naruto becomes a nukenin in order to protect a secret that could endanger the village if it were to be exposed. He leaves the village to keep this secret away from those who might misuse it. In his journey as a nukenin, he could develop new jutsu in isolation, away from the constraints of the village's training methods.