Sasuke would be deeply affected. He and Naruto had a complex relationship. His first reaction might be shock and then a deep sense of loss. He might feel guilty for not being there to help Naruto. Sakura would be heartbroken. She had always cared for Naruto, and his death would be a huge blow. She might become more determined to protect the village in his memory. And Boruto, Naruto's son, would be devastated. He would probably grow up with a strong sense of purpose to live up to his father's sacrifice and protect the village even better.
In such a fanfic, the plot could involve a powerful and overwhelming enemy attacking the village. Naruto, being the hero, would fight with all his might. He might sacrifice himself by using a powerful jutsu that could stop the enemy but cost him his life. His death would leave the village in mourning, and his friends like Sasuke, Sakura, etc., would be deeply affected. They might then vow to carry on his legacy and protect the village even more fiercely in his honor.
Sakura would likely be devastated. Naruto has been her friend and teammate for a long time. His death would leave a huge void in her life, and she'd probably go through a long period of mourning.
Another idea is that Naruto's death while protecting Sakura causes a rift between Sakura and Sasuke. Sasuke might blame Sakura for Naruto's death in some way, either directly or because he feels Naruto wouldn't have been in that situation if it wasn't for Sakura. This could lead to a complex and angsty storyline where Sakura has to deal with the guilt of Naruto's death as well as Sasuke's coldness towards her.
There could be. Fanfiction is a vast and diverse world where all kinds of crossovers and unusual plotlines can exist. However, considering that Naruto and Bleach are two separate and distinct anime universes, it's not something that would be part of the official storylines. But fans often create unique scenarios, so it's possible that someone has written such a fanfiction, though I haven't come across it myself.
Another theme could be the cost of power. Maybe Naruto's death protecting Sasuke was related to some powerful force or enemy that was after Sasuke. This shows that the pursuit of power or protecting someone with power can have dire consequences. Emotionally, the story could explore how the characters move on from such a tragic event. Some might use Naruto's death as a motivation to become stronger, while others might be paralyzed by grief.
Well, in this fanfiction, an ending might be that Hinata, in her grief, leaves the village for a while to find herself. When she returns, she has become stronger and more confident. She then devotes her life to making the village a better place, just as Naruto would have wanted. Another ending could be that the whole village unites even more tightly after Naruto's death, with Hinata at the forefront of this unity, as she was the last person Naruto protected.
One possible plot could be that an ancient evil is awakened and sets its sights on destroying Konoha. Naruto, as the Hokage or a respected ninja, rallies all his friends and allies at first. However, as the battle progresses, he realizes that the only way to truly stop this evil is by giving his own life. So he makes the ultimate sacrifice, using his chakra to seal the evil away forever, thus protecting Konoha at the cost of his life.
One possible plot could be that Naruto and Haku are in a situation where an extremely powerful enemy attacks. Naruto, being the selfless hero, jumps in front of Haku to take a fatal blow. Haku is then left with the guilt and determination to carry on Naruto's will. She might vow to bring peace to the ninja world, just as Naruto had always dreamed. This could lead to Haku joining the Hidden Leaf and trying to bridge the gap between different ninja clans in Naruto's memory.
Well, it would be a massive shock to the Naruto universe. Naruto was a key figure in promoting peace and unity. With his death protecting Ino, there could be a resurgence of old rivalries. Ino, on the other hand, would be forever changed. She might struggle with survivor's guilt at first. But over time, she could become a force for good in her own right, using Naruto's memory as a motivation. His death could also inspire other characters to reevaluate their relationships and what they are fighting for.