One possible plot twist could be that Naruto discovers a hidden aspect of the Hiraishin no Jutsu. For example, it might have a connection to an ancient Uzumaki clan ability that no one knew about. This could lead to Naruto being able to use it in ways that Minato, his father, never did.
With his friends like Sasuke, Naruto's new ability might cause some jealousy at first. Sasuke is always striving to be stronger, and seeing Naruto master such a powerful jutsu could make him feel a bit left behind. But in the long run, it could also motivate Sasuke to improve himself further and their rivalry could become even more intense.
He might learn a time - traveling jutsu. This would be really cool as it could allow him to go back and change certain events in the Naruto world, or gain knowledge from the past to use in the present battles.
His relationship with Sasuke could change significantly. Sasuke might see Naruto's newfound ability as a threat or, on the other hand, it could be a motivation for him to get stronger. Naruto might use the Hiraishin no Jutsu to try and keep an eye on Sasuke, which could either annoy Sasuke or make him secretly respect Naruto's determination.
One challenge could be the complexity of the technique itself. Hiraishin is a very advanced ninjutsu, and Naruto might struggle to understand the chakra control required for it.
In fanfiction, Naruto learning the Vacuum Jutsu could be really cool. It might give him a new and powerful offensive technique. Maybe he'd learn it from an unexpected source, like an old hermit in a forgotten land. This could potentially change the power dynamics in battles he's in.
In some cases, Naruto could be in a really tough battle where he realizes the need for a super - fast movement technique like Hiraishin. So, he starts to search for ways to learn it. He might ask Kakashi sensei about it, and Kakashi could give him some clues which lead him to begin his journey of learning Hiraishin.
Well, in 'naruto hiraishin no jutsu fanfiction', there might be the concept of different generations learning and evolving the jutsu. Maybe a new character figures out how to make the Hiraishin no Jutsu faster or more accurate. Also, some fanfictions could explore the idea of using the jutsu in non - combat situations, like for quick transportation across long distances in a more peaceful world.
Naruto is also quite popular in these fanfictions. Fans love to write about him learning the Hiraishin no Jutsu and how it changes his fighting style. He's such a beloved character in the Naruto universe that seeing him master this powerful jutsu is always an exciting concept for readers.
One interesting plotline could be a character other than Minato or Tobirama mastering the Hiraishin no Jutsu and using it in unexpected ways. For example, a young genin discovers a hidden scroll about the technique and through sheer determination and some lucky breaks, manages to learn it. This could lead to a whole new set of adventures as they try to keep it a secret from the wrong people while also using it to help their friends.