The unique element is the combination of two very different power systems. Thor has his godly powers like lightning and super strength, while Naruto has chakra - based abilities like shadow clones and rasengan. When these two meet in a fanfic, it creates exciting new combat scenarios.
I'm not sure specifically as I haven't read that particular fanfic. But it might be a story where Naruto is somehow cloned and has characteristics related to Thor, like maybe having Thor's strength or his hammer. It could be a really wild and creative crossover story.
In this 'naruto son of thor fanfic', the plot might revolve around Naruto learning about his new heritage as Thor's son. He could go on a journey to Asgard to understand more about his father's world. There, he might face challenges from the Asgardian gods who are skeptical of a half - human, half - Asgardian like him. And he has to prove himself worthy while still maintaining his ties to the Hidden Leaf Village.
He could use the hammer as a tool in combat. Against his powerful foes in the Naruto universe, the hammer's unique abilities could give him an edge. For instance, he could use it to break through strong defenses that his normal jutsu couldn't penetrate. He might also use it symbolically, to inspire his friends and allies, just as Thor uses it in his own stories.
Maybe there could be an Asgardian traitor who doesn't like the idea of a half - human being part of the royal family. This traitor could team up with some of Naruto's enemies from the ninja world to create chaos. They could plot to steal Naruto's powers or his special weapon if he has one, and Naruto has to stop them to protect both Asgard and the ninja world.
You could try looking on popular fanfic websites like FanFiction.net or Archive of Our Own (AO3). They have a large collection of fanfics, so there's a chance you'll find it there.
There's a 'naruto thor fanfic' called 'Asgardian Ninjutsu'. It's about Thor teaching the ninjas of Konoha some of Asgard's combat techniques while Naruto tries to show Thor the power of chakra. It's a really interesting concept as it combines the magic - like powers of Asgard with the ninja skills of Naruto's world. And it also has a great deal of character development for both Thor and Naruto.
One possibility is that Naruto somehow gains the ability to wield Thor's hammer. Maybe his strong will and determination, which are similar to the qualities required to lift Mjolnir in the Thor universe, allow him to do so. This could give him new powers, like the ability to control lightning in a different way than he already does with his own chakra-based techniques.
In this fanfic, Naruto might gain new powers or a special status. Since Thor's hammer can only be lifted by those worthy, Naruto lifting it could signify his great character. He could use the power of the hammer in battles against powerful foes in the Naruto universe, like Madara or Kaguya.
Well, in the 'naruto lifts thor's hammer fanfic', apart from Thor, other Asgardians like Heimdall could interact with Naruto. Heimdall, with his all - seeing ability, might have seen Naruto's worthiness from afar. The Hulk could also be involved. Imagine the chaos if the Hulk got jealous of Naruto having the hammer. And from Naruto's side, Kakashi could be there to guide Naruto on how to handle this new power that comes from a different world.