You could write a fanfic that focuses on the relationships between the characters outside of the assassination plot. Such as how the girls interact during their normal school days, forming friendships or rivalries that are not directly related to the main conflict.
A plot idea could be to create an alternate universe where the assassination game has different rules. Maybe instead of one - on - one assassinations, it becomes a team - based competition. This would change the dynamics between the characters completely.
One idea could be that Tokaku and Haru go on a journey outside the school setting. They encounter various challenges that test their relationship and loyalty to each other. Maybe they have to deal with an enemy from Tokaku's past who is trying to harm Haru.
One plot idea could be that Banba and Hanabusa are on a secret mission together. They face various challenges that test their skills and their relationship. Along the way, they start to understand each other on a deeper level and develop a stronger bond.
Well, it's interesting as it often dives deeper into the personalities of the characters. For example, in some fanfics, we get to see the inner thoughts and motives of Nio more clearly. Also, the fanfic writers can play around with the existing plot elements and create unique and engaging storylines. They might introduce new challenges or relationships that add a fresh perspective to the 'akuma no riddle' universe. Moreover, the creativity of the fans really shines through in these fanfics, as they can bring in their own interpretations of the world and characters, which can be really exciting to read.
Since I haven't read this particular 'akuma no riddle banba fanfic', it's hard to say for certain. However, generally in fanfics for 'Akuma no Riddle', they often explore the relationships between the characters in more depth. Maybe this one with 'Banba' focuses on his backstory, or his relationships with other characters in a way that the original work didn't fully explore.
A possible plot element could be a mystery that Tokaku and Haru have to solve together. This would play on the 'riddle' aspect of the original 'akuma no riddle' concept.
One possible plot could be that Isuke and Haruki start off as rivals in the dangerous world of Akuma no Riddle. They might be competing for a certain goal or mission. As they interact more, they gradually discover they have more in common than they thought. Their relationship then evolves from rivalry to friendship and perhaps something more romantic as they face various challenges together.
In this type of fanfic, a really interesting plot might be that Harry and Tom Riddle are in an alternate reality. In this reality, Hogwarts has a different set of rules and magic. They are both outsiders in this new world. They start to rely on each other for survival, and in the process, they discover new aspects of their magic and themselves. Harry tries to use this opportunity to redeem Tom Riddle, while Tom is constantly tempted by his old, dark ways.
One idea could be exploring Tom Riddle Jr.'s relationship with the original characters in a new way. For example, how he might interact with Dumbledore when there's an OC involved. Maybe the OC has a special power that Dumbledore is interested in, and Tom Riddle Jr. sees this as a threat or an opportunity. Another plot idea could be the OC coming from a different magical culture and introducing Tom Riddle Jr. to new forms of magic, which could either corrupt him further or, surprisingly, make him question his dark path. Also, a plot where the OC is a time - traveler and tries to prevent Tom Riddle Jr. from becoming Voldemort could be really exciting, full of twists and turns as they battle against fate.
One plot idea could be Naruto being transported into the Street Fighter universe and having to team up with Akuma to face a new, powerful threat that endangers both their worlds. Maybe a dark force is trying to merge their dimensions and they must use their unique skills to stop it.
The fanfic might focus on the unique dynamics between Tokaku and Haru. For example, it could show how their personalities, one being more reserved perhaps (Tokaku) and the other more open (Haru), complement each other. It may also explore their shared experiences and how those shape their relationship within the story.