Well, perhaps in this fanfiction, there could be a plot where a dark curse is placed on Hinata. As the curse takes effect, she gradually weakens until she finally succumbs and is killed. It could also be that a misunderstanding leads to her being in the wrong place at the wrong time and getting killed accidentally.
One possible plot could be that in a dark, alternate universe, Frisk accidentally wanders into a powerful monster's lair. The monster, feeling threatened by Frisk's presence, attacks without hesitation. Frisk, being human and relatively defenseless, is quickly overpowered and killed. Another plot might involve a betrayal within a group of friends. One of Frisk's so - called friends becomes envious of Frisk's popularity or kindness and devises a plan to get rid of them. They set up a situation where Frisk is in great danger and ultimately meets their demise. A third plot could be related to a curse. Frisk unknowingly breaks an ancient curse that was placed on the land, and as a result, the curse takes their life in a rather cruel and unexpected way.
A plot could revolve around the power vacuum left by Naruto. The Leaf Village is in disarray, and other villages start to make moves against it. Pain might realize that killing Naruto wasn't really what he wanted in the long run, as it led to more instability. Or maybe a character who was in the background in the original story steps up to try and fill Naruto's shoes. They struggle to gain the respect and power that Naruto had, while also dealing with the grief of his loss.
Naruto would be shattered. Given his strong sense of justice and his connection to Hinata, whether it's a romantic or platonic one. He would initially be numbed by the shock. But soon, his emotions would erupt. He could go through different stages, from mourning and self - blame (thinking he could have protected her) to a fierce determination to make things right. His actions would be driven by his love and respect for Hinata, and he would not rest until he has either avenged her or found a way to bring her back, if possible.
One common plot is that Hinata travels. She goes to different places, meets new people, and through these experiences, she slowly forgets about Naruto. For example, she might go on a journey to study a new form of ninja art in a far - off land and there, she discovers new passions.
One possible motive could be revenge. Another character might have a grudge against Lucy for something she did in the fictional world, like betraying a group or stealing something precious.
One possible plot could be that the Howler is a warning about a dangerous magical experiment Hermione is about to undertake. It scolds her for not considering the potential consequences and warns her to stop. This would put Hermione in a difficult position as she has to decide whether to heed the warning or continue with her pursuit of knowledge.
One possible plot could be that Clary gets drunk and ends up confessing her hidden feelings to someone she has a crush on.
One possible plot could be a forbidden love story. Since they are from the same clan, there might be some clan rules against their relationship. So they have to keep their feelings a secret until they can't hold back anymore and share a kiss. Another plot could be that Hinata is in danger and Neji saves her, and the relief and pent - up emotions lead to a kiss.
One possible scenario could be that he is killed in a lightsaber duel by a powerful Sith opponent. Maybe this new Sith has some secret technique that Anakin couldn't counter.
One possible scenario could be that Natsu is killed in a battle against a powerful and unexpected enemy. Maybe a new dark mage appears with powers that can overpower Natsu's fire magic.