Perhaps it involves Breezepelt getting into a dangerous situation while exploring a new territory. He might encounter a natural disaster like a landslide or a flood and unfortunately lose his life. His death could then lead to his Clanmates reflecting on his life and the way they treated him.
There could be a young apprentice in the Clan who looks up to Breezepelt. After his death, this apprentice could be the one to carry on his legacy or try to solve the mystery behind his death if it was a suspicious one. This apprentice would then be a central character in the fanfic.
One possible motive could be jealousy. Maybe Breezepelt is jealous of Jayfeather's special powers or his closer relationships within the clan. In many warrior cat stories, jealousy often drives cats to attack their fellows.
One plot idea could be that Breezepelt and Jayfeather have to work together to solve a mystery within the clans. Maybe there are strange disappearances that no one else seems to be able to figure out, and their unique skills and relationship help them get to the bottom of it.
One possible plot could be that Naruto sacrifices himself to save the village from an ultimate evil. Maybe a new, extremely powerful enemy emerges that no one else can defeat. Naruto, being the hero he is, uses all his power and in the end gives his life to protect Konoha. His death then deeply affects the members of Team 7. Sasuke might be filled with regret for all the times he opposed Naruto and Sakura would be heartbroken. Kakashi, as their sensei, would feel like he failed to protect his student.
Perhaps the fanfic shows Hermione using magic to create a memorial for her parents. She uses her skills to build a beautiful, ethereal space filled with images and memories of them. As she does this, she encounters some challenges, like interference from dark magic remnants in the area. But with her determination and knowledge, she overcomes these and creates a place where she can go every year on the anniversary to feel closer to her parents.
In a 'bruce banner death fanfic', it could be that Banner is tricked by a powerful villain into believing that his continued existence is a threat to all of humanity. Depressed and believing he has no other option, he takes his own life. This could lead to a complex exploration of the ethics of superheroes and the power they hold, as well as the impact of Banner's death on his friends and the world at large.
Well, perhaps Harry could be using his magic skills to outwit the Stormtroopers. Maybe he's on a mission to find a powerful magical artifact that has ended up on the Death Star by some strange magic. He might use spells like 'Expelliarmus' to disarm the imperial soldiers and his invisibility cloak to sneak around the Death Star's corridors.
One possibility is that Amy would turn her grief into motivation. She could take on Sonic's role in protecting their world. She'd train harder, be more vigilant, and vow to defeat any threats that Sonic used to face. Her reaction could also involve her reaching out to Sonic's other friends, and together they could form a stronger bond in his memory, while also dealing with their own individual griefs.
The plot could be that Carson is about to celebrate his birthday. But he is in deep mourning for Jack who has just passed away. Carson decides to have a small, quiet birthday celebration. During the celebration, he shares stories about Jack with his close friends. These stories could be about the adventures they had together or the times Jack helped him. As the night falls, Carson goes to a place that was special to him and Jack and has a moment of silent remembrance.
Perhaps it's a story set in a post - apocalyptic world. Harry and Tony Merchant were trying to survive. They got into a conflict with a brutal gang. During the fight, Merchant got fatally injured. Harry then had to carry on with Merchant's unfinished business and seek revenge.