Another interesting fanfic could be a character - centered one, where it delves deep into the psychological state of a particular character. Like exploring the inner turmoil of a detective as he grapples with the dark and disturbing cases in Crimson Rivers, and how it affects his personal relationships.
One idea could be a prequel fanfic that delves into the backstories of the main characters before the events of the original. For example, exploring their early days in the police force or their first encounters with the strange cases that would later shape them.
A fanfic could also focus on an alternate universe where the characters have different personalities or occupations. Maybe one of them is a journalist instead of a detective, and how that changes the dynamic of the story and their investigations.
Crimson Rivers fanfic typically explores alternative storylines or expands on existing characters and events from the Crimson Rivers universe.
One interesting story could be about the characters solving a mystery that was not fully explored in the original work. For example, they might discover a hidden society within the town that has been causing all the strange events.
I'm not sure specifically as there could be many different 'Crimson Rivers' Harry Potter fanfics. Generally, it might involve new adventures in the Harry Potter universe, perhaps with a focus on a mysterious 'Crimson Rivers' element. It could be about new characters related to it, or a new plotline that twists the original story in a way related to these crimson rivers.
One idea could be exploring the origin of the 'crimson darkness'. Maybe it was created by an ancient and powerful magic that has been lost over time. Another could be a story about a hero who has to face the crimson darkness alone and discovers a way to purify it.
Maybe the story could be about a group of outcasts. The 'crimson' is a symbol on their bodies that marks them as different. Their ennui comes from being constantly ostracized. As the fanfic progresses, they find a way to turn their mark into a strength and fight against the society that shunned them.
Think about the story you want to tell. Is it a continuation of the existing plot? Or something completely new? Decide on the main plot points, like the mystery or conflict your characters will face.
You can try looking on popular fanfic websites like Fanfiction.net or Archive of Our Own (AO3). They have a vast collection of Harry Potter fanfics, and you might be able to find the 'Crimson Rivers' one by using the search function on those sites.
There could be a fanfic where the Crimson Door is a portal to a magical world. The story could focus on a group of friends who accidentally stumble upon it and have to find their way back home while facing various challenges in this new world. For example, they might meet talking animals or powerful wizards.
One interesting Crimson Flag Fanfic could be about the characters' journey in a mysterious land. They might face various challenges and discover hidden powers within themselves.
Well, a great plot for 'naruto crimson avatar fanfiction' could be centered around a tournament. Naruto and his friends enter a tournament where they have to use their new Crimson Avatar powers. But there's a catch - the tournament is being secretly manipulated by an old enemy who wants to steal these powers for themselves. The characters must not only compete but also figure out the enemy's plot and stop them.