Perhaps in the fanfiction, there's a misunderstanding. Guy Sensei thinks Tenten has stolen a valuable jutsu scroll or something important to him. Naruto, knowing Tenten is innocent, stands in front of her. He might try to reason with Guy Sensei first, using his charm and quick - thinking. If that doesn't work, he'll be ready to fight, using his Rasengan if necessary.
In the fanfiction, Naruto's new sensei could be a mysterious figure who has ties to the Sage of Six Paths. This person might have been waiting for the right time to appear and train Naruto. They could possess knowledge about the origin of chakra and how to fully unlock Naruto's power. It could also be someone who was once an enemy but has now changed their ways and wants to use their skills to train Naruto for the greater good of the ninja world.
There's a chance that Naruto's new sensei could be a self - taught ninja who has developed their own unorthodox style. This person sees Naruto's ability to think outside the box and wants to refine that in him. They could introduce Naruto to a new way of looking at chakra control and combat strategies that are completely different from what he has been taught so far.
His relationships would also develop. By protecting Tenten, he would earn her trust and respect. This could lead to a stronger bond between them and also with other members of their ninja group. Naruto might also gain a new perspective on Guy Sensei, understanding that even strong and respected teachers can be vulnerable to certain influences. He would learn to look beyond the surface and be more empathetic towards others.
I think Orochimaru would be the most unexpected sensei. Usually, he's seen as a villain, but in a fanfiction, if he were to train Naruto, it would be extremely unexpected. He has a vast knowledge of jutsu, especially forbidden ones. He could teach Naruto some very powerful and unique abilities, but at the same time, Naruto would have to deal with Orochimaru's morally ambiguous nature.
Yes, there are likely fanfics with this concept. Fanfiction platforms have a wide variety of creative works. You can check popular Naruto fanfic sites like Fanfiction.net or Archive of Our Own. Just search for 'Naruto is Kushina Sensei' and you might find some interesting stories.
Well, it really depends on the specific fanfic. There are countless Naruto fanfics out there, and some might indeed have Ibiki as Naruto's sensei. This could be an interesting twist as Ibiki has his own unique skills and personality. He could teach Naruto some different things compared to the original senseis in the Naruto story, like more about interrogation techniques or mental fortitude in a different way.
Tenten would also be an interesting choice. She could focus on weapon - based combat training for Team 7. Since she has extensive knowledge of all kinds of weapons, she could introduce new and unique weapon techniques to the team.
Naruto is often paired with Ebisu Sensei in fanfiction. Since Ebisu was assigned to train Naruto at one point, many fanfictions build on that relationship, showing how Naruto grows under his tutelage and how Ebisu has to adapt to Naruto's unorthodox ways.
Anko's a bit of a rebel in some ways. This could encourage Naruto to think outside the box when it comes to ninja tactics. He wouldn't be so bound by the traditional ways. For example, he might come up with new ways to combine his Rasengan with other jutsu based on Anko's unorthodox thinking. Also, her somewhat edgy personality could make Naruto more street - smart and less naive in the ninja world.