A plot about a time - traveling thief could be really engaging. He steals valuable items from different historical periods, and a team of historians - turned - detectives has to chase him across time to retrieve the artifacts.
Well, you can start by looking at the existing relationships in the original work and flipping them. In a Star Wars fanfic, instead of Luke being the hero, make it Leia who discovers she has the Force first and becomes the main Jedi. Or take a character from one story and put them in the setting of another. Like a character from Lord of the Rings ending up in the world of Game of Thrones. It's all about mixing and matching elements.
One idea could be that Naruto is hired to protect a young noble from a rival clan. He uses his ninja skills like shadow clones to keep an eye on every possible threat. He also befriends the noble and teaches him some basic self - defense moves.
A possible plot in Jiraiya time travel fanfiction could be Jiraiya traveling back to the time when the Uchiha clan was still intact. He could try to prevent the massacre, which would have a huge impact on the Naruto story. This would change the relationship between Sasuke and Naruto, as Sasuke's motives for revenge would no longer exist.
Perhaps in the fanfiction, they get engaged in a very magical setting, like on top of a floating mountain in Bulgaria. Then they have to plan a wedding that combines both wizarding cultures, which is full of challenges and fun cultural exchanges.
One idea could be that they find out about the pregnancy during a time of peace in their world. They are both overjoyed and start preparing for the new life. Tamahome becomes extremely protective of Miaka, and they share many tender moments as they anticipate the arrival of their baby.
One idea could be that Wesley and Bianca face unexpected challenges during the pregnancy. Maybe they struggle with financial issues as they prepare for the baby. Another could be that they discover some long - lost family secrets during this time that add drama to the story.
One potential plot is a story that focuses on the relationship between the Jedi and the clones. Maybe there are some clones who have developed Force - like abilities and the Jedi have to decide how to deal with them. It could be a very complex and morally ambiguous story. Another plot could be a Star Wars story set during a long - forgotten era, where the rules of the Force were different. This would allow for new types of characters and powers. Thirdly, they could do a story about a young Sith apprentice who rebels against the Sith teachings and tries to find a new way, which would put them at odds with both the Sith and the Jedi.
The fanfic could start with Blake being bitten by a vampire - like creature during a solo mission. As she slowly turns, she starts to have visions of an ancient war between vampires and some powerful beings in Remnant's past. Yang, Ruby, and Weiss notice her changes and set out to find a cure. Along the way, they learn more about Remnant's history and the true nature of the vampire infection, which might be related to some sort of powerful magic or ancient technology.
Probably not. Inspiration can come from anywhere, like dreams, nature, or even random conversations. There's so much around us that can spark new ideas for plots and stories.