One possible fanfiction could be about Harry's struggle with the Blood Quill in a more in - depth way. Maybe it shows how he copes with the physical and mental pain it causes. He could be trying to find a way to break the magic of the quill without getting caught by Umbridge.
In this fanfiction, the Blood Quill might be a central element in a mystery. For example, Harry discovers that the Blood Quill has a much darker origin than he thought. It could be linked to an ancient dark magic that Voldemort is also interested in, and Harry has to race against time to figure out how to destroy it before Voldemort gets his hands on it.
There might be a fanfiction where the blood quill is stolen from Umbridge and used against her. The story could explore how the tables are turned and she experiences the pain it causes. It could also show how the students who were once victims gain power from this act.
A plotline could be where the Blood Quill is used by a different villain. Suppose a new dark wizard or witch gets hold of the Blood Quill and uses it to torment students at Hogwarts. Harry and his friends then have to find a way to stop this new threat.
A great fanfiction I recall is one where the blood quill starts to write prophecies when used. The prophecies are related to the future of Hogwarts and the wizarding world. Harry and his friends have to decipher these prophecies while also dealing with the fact that the blood quill is causing harm to those who use it.
It often changes their view of authority. Characters who have experienced the blood quill first - hand might start to question and rebel against any form of authoritarian rule in the wizarding world. They would see that not all those in power are good, and they would strive to create a more just and equal society within the fanfiction's narrative. This can lead to all kinds of political and social upheaval in the story.
Some fanfictions might explore the origin of the blood quill in more depth. Maybe it was created by an ancient and evil wizarding sect. In these stories, the blood quill isn't just a tool for torture but has a deeper, more sinister backstory. For instance, it could be tied to a dark prophecy or a long - forgotten curse that the main characters have to uncover in order to defeat an emerging threat.
Another plot could involve a character who is forced to use the Blood Quill and they start to have strange visions. These visions lead them on a journey to find a way to break the dark magic associated with the quill. They might meet some unexpected allies along the way, like a house - elf who has knowledge of forgotten magic that can help.
On the other hand, some characters might become more determined to fight against injustice because of the Blood Quill. They see the cruel use of the quill as a symbol of the wrong kind of authority in Hogwarts. So, it can be a catalyst for character growth and rebellion in a way, inspiring them to stand up against those who misuse power like Umbridge.
Fanfiction often takes the original elements of a story and twists them. In 'harry potter and the blood fanfiction', it could be that the author explores the significance of pure - blood, half - blood and Muggle - born status in a different way. For example, they might create a story where the blood status of a character is the key to unlocking a powerful magic that was previously unknown in the original Harry Potter series. It could also be about a secret society that is formed based on blood relations within the wizarding community.
I'm not sure specifically as I haven't read that particular fanfiction. But generally, in the Harry Potter universe, a 'paid in blood' concept could be something very dark. It might involve a character having to sacrifice something extremely precious or endure great pain (like blood being a symbol of sacrifice) for a certain goal, perhaps related to magic, power, or saving someone.
I'm not sure specifically as there could be many different 'bad blood' themed Harry Potter fanfictions. It might be about a feud or bad relationship between certain characters in the Harry Potter universe, like perhaps a rift between two wizarding families or old grudges among Hogwarts students.