Another place is FanFiction.net. There are some really good and unique 'Akuma no Riddle' fanfics there. Just use the search bar and type in 'Akuma no Riddle' to find relevant stories.
One great 'Akuma no Riddle Fanfiction' is 'The Unspoken Bond'. It delves deep into the complex relationships between the characters. The author does an amazing job of exploring the emotional depth that the original series only hinted at.
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.
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.
There could also be an antagonist or a group of antagonists. They would be the ones creating obstacles for the main character and other protagonists. Their actions and motives would be crucial to the development of the mystery and the story as a whole. They might be trying to prevent the riddle from being solved for their own gain or to maintain some sort of power or control within the world of the light novel.
One great Akuma no Riddle crossover fanfiction is 'Akuma no Riddle Meets Another School'. It combines the unique characters from Akuma no Riddle with a different school setting, creating interesting new dynamics. The interactions between the assassins and the new characters are really engaging.
There are several places to look for this fanfic. Start with the general fanfic platforms. AO3 is known for its large and diverse collection of fan - created works. It has a good tagging system, so if you search for 'Akuma no Riddle' and 'Banba', you might get lucky. Another option is to join 'Akuma no Riddle' - related forums or groups. Fans in these communities often discuss and share fanfics among themselves. You can also try using search engines, but be specific in your search terms to get more accurate results.
The characters in Akuma no Riddle are very distinct. Each assassin has her own backstory, motives, and personality. When these characters are put into a crossover situation, it allows for a lot of exploration. Writers can develop new relationships between the Akuma no Riddle characters and those from the other crossover world, which is very appealing to readers.
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.