Maybe a story where Naruto and Sasuke have to team up in a different dimension where all their powers are reversed. Naruto has to use Sasuke - like intelligence and Sasuke has to rely on Naruto - like brute strength. It would be a really interesting take on their characters.
One idea could be a time - travel plot where Naruto and Sasuke are sent back to their childhood days and have to relive certain events with the knowledge they have now. This could change the course of the entire Naruto storyline.
One interesting 'Naruten fanfic' story could be about Naruto and his friends going on a new adventure in a hidden land filled with unique creatures. Another might be a story where Naruto discovers a new form of his chakra that gives him unexpected powers.
One idea could be exploring the unspoken stories of the ranch hands. Maybe there's a hidden love affair between two of them that has to be kept secret due to the social norms of 1923. Another could be focusing on how a young character dreams of leaving the ranch and going to the big city, but faces many obstacles. And a third idea could be a mystery plot where strange things start happening on the ranch and the characters have to figure out what's going on.
One idea could be Android 21's struggle to fit into a world that fears her. She has to prove that she's not a threat and tries to make friends. Another could be her discovery of new powers and how she uses them for good. Maybe she teams up with other characters to fight a common enemy.
One idea could be Vampirina making new friends in the human world who are initially scared but then come to understand her. For example, she could join a school club and have to prove that she's not a threat.
Another plot could involve a crossover within the Darksiders universe. Maybe the Horsemen have to team up with a previously unknown group of characters to face a new, greater threat. This could introduce new dynamics and relationships.
Another plot could be a different version of Vision's 'rebirth' in the show. What if there were more glitches and he had to figure out his identity in a completely different way? This could lead to some really cool interactions with Wanda and the other characters.
A great plot for DuckTales 2017 fanfiction could be an alternate universe story. In this universe, Scrooge never became rich and the Duck family has to struggle in a different way. It could show how their relationships and personalities would change without the wealth. Also, a story where the nephews get to run the business for a day and end up getting into all sorts of hilarious and dangerous situations. Maybe they make a deal with a dodgy character that seems good at first but turns out to be a big problem. And then there could be a fanfiction about the origin of the Money Bin, with Scrooge having to face many challenges and enemies to build it.
One plot idea could be exploring the further development of the Braverman family's relationships in different life stages. For example, how the siblings support each other during a major career change. Another could be focusing on a character's hidden talent that emerges and how it impacts the family. And also, a story about the family dealing with a long - lost relative coming back into their lives.
One idea could be exploring the backstory of the mummy in more detail. Maybe she had a family or a great love before she was mummified. Another could be a different take on the relationship between the mummy and the main characters, like if they formed an unexpected alliance. And perhaps a fanfiction where the mummy's powers are used for good instead of evil in the modern world.
The Punisher could be written into a fanfiction where he travels to a different city to take on a crime syndicate that has a connection to his past. Maybe it was the syndicate that was involved in the death of his family in some indirect way. Along the way, he meets local allies who help him understand the different dynamics of the city's underworld. He also has to deal with the local police force, some of whom are corrupt and some who are trying to do the right thing but are in over their heads.