One interesting idea could be exploring the darker sides of the characters. For example, showing how Naruto might struggle with more internal demons. Another could be re - imagining the story in a post - apocalyptic setting within the Naruto universe. Maybe Konoha has been destroyed and Naruto has to lead the survivors in a harsher world.
Some fanfictions in this category might explore the concept of time - travel. Naruto could go back in time and try to prevent certain tragedies from happening. This would change the entire course of the story and introduce a lot of interesting plot twists. He might have to make difficult choices, like sacrificing some relationships in order to save the village from a greater threat that he knows will come in the future.
A more complex fanfiction could be about a prophecy that involves both Naruto's world and the Grim Tales world. Characters from both sides would have to come together, like Naruto and some of the heroes from Grim Tales, to prevent a great disaster that would affect both universes. This would involve a lot of character development and world - building as they try to understand each other's cultures and powers.
One idea could be creating an OC who is a long - lost relative of one of the main characters in Grim Tales. This OC could bring a new perspective and some hidden family secrets. For example, if the main character is a hero, the OC could be a villainous relative who challenges their beliefs and morals.
One idea could be a crossover with a classic fairy tale world. For example, merging the dark elements of Grim Tales with the magical world of Cinderella. The step - sisters could be even more malevolent in the Grim Tales version, and Cinderella could have some hidden powers. Another idea is to cross it with a superhero universe. Picture a superhero trying to solve the mysteries and dark secrets in the Grim Tales world. They would face challenges that are not just physical but also psychological due to the grim nature of the world.
One idea could be to cross it with a popular fantasy series like 'Lord of the Rings'. The dark and spooky elements of Grim Tales could blend well with Middle - earth's magical creatures and landscapes. For example, the main character from Grim Tales could find themselves in Middle - earth and have to deal with orcs and other threats while also trying to find a way back home.
One plot idea could be that Naruto is somehow transported to the world of Tales of Symphonia. He might use his ninja skills to help the characters in their quests. For example, his shadow clone jutsu could be used to confuse enemies during battles. Another idea is that a character from Tales of Symphonia ends up in the Naruto universe and has to adapt to the ninja way of life, like learning to use chakra.
Naruto himself is often a popular character in Naruto Grim Tales fanfiction. His journey can be re - written in much darker and more complex ways. Sasuke is also popular as his relationship with Naruto can be explored from a different, more somber perspective. Sakura too can be a key figure as she might have to face harsher challenges and grow in unexpected ways.
Some popular themes could be adventure. Grim Jr and Mimi might go on exciting adventures together, exploring strange and magical places. Another theme could be friendship. Their relationship could be centered around growing and learning from each other as friends. Also, mystery could be a theme, like they are trying to solve some strange happenings in their fictional world.
One idea could be a story where a new character, with the power of a Grim Reaper, arrives at Beacon Academy. This character has the ability to see the souls of the Grimm and can communicate with them in a strange way. They could be initially seen as a threat but end up helping Team RWBY in a big battle against a horde of powerful Grimm.
Create an engaging plot. Maybe start with a mystery or a threat that forces the characters from both worlds to interact. For example, a powerful dark force is emerging that only the combined efforts of Naruto and the Grim Tales characters can stop. Also, focus on character relationships. How do the Naruto characters view the Grim Tales ones and vice versa? This can add depth to your story.
One interesting Naruto Sakura tale in fanfiction could be where Sakura becomes a powerful ninja independently, without relying on Naruto or Sasuke all the time. She might go on a solo mission to a far - off land and discovers new forms of chakra control.