What are some interesting plot ideas for 'Harry Potter Prisoner' fanfiction?

One idea could be exploring Sirius Black's life more in depth during his time on the run. Maybe he had some secret encounters with other magical creatures that he never told Harry about.

One interesting plot idea could be a new character being introduced who has a special connection to the Shield in the story. Maybe this character has the power to enhance the Shield's abilities and uses it to protect Hogwarts in a different way than expected.

One idea could be exploring Sirius Black's time on the run in more detail. Maybe he had some secret encounters with other magical creatures that he didn't tell Harry about. Another could be a story from the perspective of Remus Lupin during his time as a teacher at Hogwarts that year, and how he was constantly worried about his werewolf secret being exposed while also trying to protect Harry. A third idea could be a fanfic that focuses on Hermione's time - turning device, and what would happen if she accidentally sent herself back too far in time and had to find a way to get back to the right time without disrupting the timeline too much.

A cool plot twist might be that the time - turner Hermione uses has some unforeseen side effects. Instead of just allowing her to attend more classes, it starts to create glitches in time that cause different events from the past to bleed into the present. For instance, old spells from the founders of Hogwarts start to randomly appear in the corridors, and the characters have to figure out how to stop this chaos while also dealing with the Sirius Black situation.

One common plot idea is exploring Sirius Black's life more in - depth. Maybe a fanfiction could focus on his time in Azkaban before his escape, showing his mental state and how he coped. Another idea is changing the roles. For instance, what if Hermione was the one who was wrongly accused instead of Sirius? It would create a whole new dynamic.

One idea could be exploring the backstory of the 'Prisoner of Sand' character in more depth. Maybe they have a hidden past related to a long - lost shinobi clan in the Sand Village. Another idea is a rescue mission where Naruto and his friends try to free the 'Prisoner of Sand' from some powerful enemy who has captured them for their unique abilities. A third idea could be a story where the 'Prisoner of Sand' has to team up with Naruto to stop a greater threat to both the Leaf and Sand Villages, and in the process, they learn to overcome their differences.

One idea could be Hermione discovering a hidden spell in the Prisoner of Azkaban events that helps her protect Harry in a more unique way. For example, a spell that can temporarily freeze time around a small area, allowing them to escape from danger more easily.

A great plot could involve Kairi finding an unexpected ally within the prison of darkness. This ally could be someone who was once an enemy but now has a common goal with her. She could also start to understand the true nature of the darkness and find a way to use it to her advantage, rather than being completely overpowered by it.

One interesting plot twist could be that Sirius Black is actually being framed by a more powerful dark wizard who has the ability to disguise as others. This would add an extra layer of mystery.

In some fanfics, Lupin might turn out to be under the influence of a spell that makes him seem more dangerous than he actually is. Maybe the real threat is a hidden character who is using Lupin's condition to create chaos. For example, they could be making him lose control of his werewolf form more often than normal, which would lead Harry and his friends to suspect Lupin wrongly.