Perhaps Naruto is betrayed by someone he trusts deeply. This person leads him into a trap at the Valley of the End. Naruto, being caught off - guard, is fatally wounded. His death in this fanfiction could be a tragic end to his journey of becoming a great ninja and a symbol of how even the most powerful can be brought down by treachery.
Madara Uchiha might be the main antagonist. He has grand plans for the ninja world. He could see Naruto as a threat to his vision and engineer a situation in the Valley of the End where Naruto is killed, either directly or by using Sasuke as a pawn.
Perhaps in this fanfiction, Naruto is fatally injured by a powerful enemy who has lured him to the Valley of the End. He's outnumbered and despite his best efforts, he succumbs to his wounds. His death then has a profound impact on all his friends and the entire ninja community, leading to a new era of unrest and a search for a new hero.
Sasuke could be responsible. Their relationship has always been complex. Maybe in this fanfiction, their rivalry escalates to a point where Sasuke accidentally kills Naruto during a fight at the Valley of the End.
Perhaps in this fanfic, Naruto's death at the Valley of the End could lead to a new era of power struggles. The other ninja villages might try to take over the Leaf's territory. Meanwhile, Naruto's death could inspire a new generation of ninjas who want to uphold his ideals. They would have to fight against the odds to keep the peace that Naruto once fought for.
Sakura would be devastated. She has always seen Naruto as a dear friend and teammate. She would probably blame herself for not being strong enough to prevent his death. Sasuke, on the other hand, might feel a deep sense of loss and anger. He might go on a solitary journey to find out who was responsible.
Yes, there are some. Some fanfictions explore this dark concept in interesting ways. They might show how his death impacts the shinobi world, like the grief of his friends and the power vacuum it creates.
I'm not sure of a specific title off - hand, but you can often find great ones on fanfiction websites. Look for ones with high ratings and lots of reviews. They usually are the better - written ones.
Naruto's relationship with the new generation of ninjas would be interesting. They've only heard stories about him. His resurrection would make him a sort of legend come to life. Some might idolize him immediately, while others might be skeptical. He would have to earn their trust and respect all over again, and in the process, he could form new and unique relationships with these young ninjas.
Well, a plot twist might be that Naruto's resurrection is part of a grander scheme by an old enemy. This enemy brought him back not out of kindness but to use him as a weapon. Naruto, being Naruto, would then have to fight against this control while also dealing with the changes in the ninja world since his death.