There are some interesting Naruto and Alien Queen fanfictions out there. One I've read had Naruto somehow transported to the Alien universe and having to face the Alien Queen. It was a really unique take on both universes, with Naruto using his ninja skills in a very different and hostile environment.
I'm not sure about a specific 'must - read' but generally, in these fanfictions, the clash between Naruto's chakra - based powers and the Alien Queen's physical and reproductive horror is really interesting. Writers often explore how Naruto's values and his will to protect would interact with the survival - of - the - fittest nature of the Alien world. Some also play with the idea of Naruto befriending or taming the Alien Queen, which is a very different take on both characters.
One possibility could be that in this fanfiction, Fem Naruto has the physical traits of an alien queen. Maybe she has the ability to command a horde of alien creatures. For example, she could use her ninja skills in combination with the alien queen's powers to lead an invasion or to protect her new 'alien family'.
One great 'Swan Queen back in time' fanfiction is 'A Different Time'. It takes Regina and Emma back to the Enchanted Forest's past. The author does an amazing job of portraying their relationship development in that historical setting.
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.
One interesting fanfiction could be 'The Abduction of Oliver Queen'. In this story, the author might take a unique approach to his kidnapping, like involving a new villain who has a personal vendetta against Oliver. Maybe they target him because of his actions as the Green Arrow, but instead of the typical rescue mission, his friends have to go through a series of complex puzzles left by the kidnapper to find him.