A really creative one is 'Guilty Crown Elements in Naruto's World'. It imagines what would happen if the technology and power concepts from Guilty Crown were introduced into the Naruto universe. It has some amazing battle scenes where Naruto and his friends face new threats with a blend of both worlds' powers.
One great Guilty Crown time travel fanfiction is 'A New Beginning'. It takes the characters back in time and explores how they could change the course of events. The story is really engaging as it shows the characters' growth and how they adapt to the new time period.
A common theme is power exchange. Like Naruto getting some of the powers from Guilty Crown and vice versa. It makes for really exciting battles and character development.
One great Naruto Gunblade fanfiction is 'The Gunblade's Legacy'. It delves into a world where Naruto discovers an ancient gunblade and has to master its power. The story combines the action - packed nature of Naruto's battles with the unique concept of a gunblade, making for an exciting read.
One great Naruto and Harribel fanfiction is 'The Unlikely Alliance'. In this story, Naruto, during one of his missions, stumbles upon Harribel in a rather strange situation. Their initial distrust gradually turns into mutual respect as they face a common enemy that neither of them could defeat alone. It's a well - written piece that really explores their characters in a new light.
One great Naruto and Deadpool fanfiction is 'The Unlikely Duo'. It combines the humor of Deadpool and the ninja world of Naruto in a really fun way. The story has them team up to take on a new villain that's threatening both their worlds.
There are some really interesting Naruto and Astolfo fanfictions out there. One that stands out often involves Astolfo somehow getting transported to the Naruto universe. In these stories, the clash of their different worlds' magic and ninja techniques can create really engaging plots. For example, Astolfo's noble phantasm might interact in unexpected ways with Naruto's jutsu.
I also recommend 'Naruto and Deadshot: The Contract'. Here, Deadshot is hired to take out Naruto but instead, they end up forming an uneasy partnership. The author does a great job of exploring both characters' backstories and how they can find common ground despite their differences.
A lot of these fanfictions play around with the idea of bringing the magic and unique abilities from Naruto into the more medieval - ish world of For Honor. Some are action - packed, with epic battles between Naruto characters like Naruto himself or Sasuke and the For Honor warriors. Others focus more on the relationships that could form between characters from the two different franchises, which can be really engaging to read.
There's a fanfic called 'Doomguy in the Hidden Leaf'. In this one, Doomguy gets transported to the Naruto universe. It's interesting to see how he interacts with the different ninja clans, especially when his no - nonsense attitude clashes with the more traditional ways of the Leaf Village. It's a short but engaging read.
There could be a fanfic that focuses on the backstories of Shu and Gai and how those past experiences shape their present relationship. It might explore how their different upbringings contribute to their actions and decisions when they interact with each other in the main story of Guilty Crown.