One idea could be a story where a new vampire joins the Visual Prison and has to prove himself through his unique musical abilities. He might face challenges from the existing groups who are threatened by his fresh style.
Perhaps a story about a group in the Visual Prison that loses their way. They start to use dark magic in their performances to gain an edge, but it slowly corrupts them. Another group then has to step in and save them from this self - destruction while also dealing with their own musical rivalries.
A plot could revolve around a love story within the Visual Prison universe. For example, a vampire falls in love with a human who is somehow connected to the music industry. They have to overcome the differences between their worlds and the rules of the vampire society in the Visual Prison.
One idea could be Sakura using her intelligence to outwit the prison guards and help other inmates. For example, she might find a loophole in the prison rules that benefits the inmates in some way.
Maybe a fanfic where Naruto himself is imprisoned by an enemy village that has a false accusation against him. He then tries to break out not just for his own freedom but also to prevent a war that the false imprisonment might trigger. He could inspire other prisoners to join his cause through his unwavering spirit.
Another plot could be that Harry is imprisoned because of a powerful spell gone wrong that had unintended consequences. Inside the prison, he finds a long - forgotten magical artifact that holds the key to not only his freedom but also to solving a greater threat to the wizarding world. He has to figure out how to use it while dealing with the dangerous inmates and strict prison guards.
One idea could be a crossover with 'The Walking Dead'. Michael Scofield and the gang could find themselves in a post - apocalyptic world full of zombies. They'd have to use their prison - break skills to survive against the undead. Another could be a crossover with 'Lost'. Maybe they end up on the mysterious island and have to deal with the strange phenomena there while also trying to escape from some sort of new prison - like situation created by the island's secrets. A third idea is a crossover with '24'. Jack Bauer could team up with Michael Scofield in a high - stakes situation where they have to break someone out of a highly - guarded prison within 24 hours while also stopping a terrorist threat.
Perhaps in the fanfiction, Bella is also in prison for some unjust reason. Edward, being a vampire, has to use his special abilities secretly to protect her from the other inmates. He could be using his mind - reading skills to anticipate threats.
One idea could be exploring a character's backstory who was wrongly imprisoned in the Blood Prison. For example, a shinobi who was framed by a powerful enemy and has to prove their innocence while dealing with the harsh conditions and dangerous inmates in the prison.
Well, a plot idea could involve Haren being framed and sent to the Blood Prison. Once there, he uncovers a conspiracy that reaches outside the prison walls. He then has to find a way to expose it while dealing with the prison's internal power struggles and dangerous inmates. This could involve using his wits and any latent ninja skills he might have.
One idea could be the main character having to protect the harem members within the dangerous Blood Prison setting. Maybe there are secrets about the prison that only the harem members know, and they rely on the main character to uncover them while fending off other threats.
In some fanfictions, Naruto might gain an unexpected power - up while in the Blood Prison. This new power allows him to not only escape but also take on the forces that put him there in the first place. It could be related to his Uzumaki heritage or a new form of sage mode.
Another plot could involve Naruto having to deal with a hidden power within the Blood Prison that is starting to corrupt the inmates and guards alike. He has to find the source and stop it. For example, there could be an ancient curse that was placed on the prison long ago and is now awakening. Naruto, with his strong will, tries to resist the curse's influence while also finding a way to break it for everyone else.