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.
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.
One common theme is redemption. Since Breezepelt has had a troubled past, many fanfics explore how he can redeem himself through his relationship with Jayfeather. Another theme is friendship - turned - love, as they start from being just acquaintances or even enemies and gradually develop deeper feelings.
Jayfeather might initially be taken by surprise. Since he is blind, he may not be able to sense Breezepelt's approach as easily as a sighted cat. But then he would quickly rely on his other senses, like his hearing and sense of smell, to figure out what's going on and defend himself.
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.
Well, it's interesting because it takes the characters from the Warriors series and gives them a human twist. Jayfeather and Breezepelt have complex relationships in the original series, and seeing how those relationships might translate into a human setting can be really fascinating. For example, their conflicts and possible reconciliations could be explored in new ways.
I'm not sure about a specific 'jayfeather x breezepelt fanfic' but you can try searching on fanfic platforms like Archive of Our Own. There are likely many stories there that focus on their relationship. You can filter by tags like 'jayfeather', 'breezepelt' and'relationship' to find relevant fics.
Their relationship can start from a place of mutual suspicion. Given their different clan backgrounds and past interactions, this is a natural starting point. Then, small acts of kindness or cooperation can gradually chip away at the walls between them. For example, if they share a common enemy or a mutual goal like protecting a group of kits that are in danger.
A plot could revolve around Breezepelt getting injured and Jayfeather having to heal him. During the healing process, they have long conversations and discover that they have more in common than they thought. This could lead to a friendship or something more, as they both realize that their clans' views have kept them apart for too long.
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.