It's possible that their training would focus on teamwork. They are both part of the same village, and better teamwork can benefit the whole community. Shikamaru could come up with complex training drills that require Naruto to use his speed and strength in coordination with Shikamaru's planning. This would not only improve their individual skills but also their ability to fight as a team.
In the fanfiction, they could face a common enemy. Naruto, with his powerful ninjutsu and Shikamaru, with his clever strategies, would have to work together. For example, they might be up against a group of rogue ninjas. Naruto could be the main force in direct combat, while Shikamaru uses his shadow jutsu to immobilize the enemies at crucial moments, and during their training, they prepare for such scenarios.
However, Naruto also has a lot to offer. So, in a way, they could be mutual mentors. Naruto's unwavering determination and his experience in facing powerful foes could inspire Shikamaru to be more bold in his actions. So, it's not necessarily a one - way mentorship.
Well, Naruto would probably become extremely powerful. Goku's training methods are intense and focus on pushing physical limits. Naruto, with his already strong will and chakra, could gain new levels of strength. He might learn how to better control his chakra in ways similar to how Goku controls his ki. Also, Goku could teach Naruto some of his signature moves, like the Kamehameha, which Naruto could potentially adapt to his own style using chakra.
In a time - travel fanfiction like this, they could also have the opportunity to meet long - lost characters or discover secrets that were lost in time. Naruto and Shikamaru could learn about the origin of some of the powerful jutsus in their world. And perhaps they could use their knowledge of future technology or ninja tools to create something revolutionary in the past. This could potentially change the balance of power among the ninja villages. However, they would also have to be careful not to be discovered as time - travelers, as that could lead to all sorts of complications.
If Kushina trains Naruto for the Chunin Exams in fanfiction, it would be an amazing story. Kushina was a powerful kunoichi. She could train Naruto in areas he lacks, like better chakra control perhaps. Also, their mother - son bond would be beautifully explored during the training sessions. Naruto would probably become more confident and his combat skills would improve significantly.
In this fanfiction, Naruto might gain some unique jutsu skills from Itachi. Itachi is a very powerful shinobi, so he could teach Naruto advanced techniques of chakra control and some secret Uchiha clan jutsu.
One possibility is that their kids would have a very special relationship with the other ninja families in the village. Since Naruto is so well - known and Shikamaru is highly respected for his smarts, the kids might be expected to live up to great expectations. They could also be the center of some new friendships and rivalries among the younger generation of ninjas. And perhaps they'd be involved in some new adventures that are related to the peace - building efforts in the village, just like their parents were in different ways.
In the 'naruto trains boruto fanfic', Naruto might teach Boruto some powerful ninja techniques. For example, he could show Boruto how to master the Rasengan more effectively. Maybe he'd also train Boruto in the art of stealth and how to read an opponent's moves better.
It's possible that in some very niche or dark fanfictions, Naruto Shikamaru could be presented as a sociopath. But this is a huge deviation from his canonical character. In the original series, Shikamaru is known for his laziness on the surface but deep down he has a strong sense of duty and connection to those around him. Fanfiction writers may use the idea of him being a sociopath to add an edgy or different perspective, but it goes against the essence of who he is in the official story. For example, his relationships with Naruto, Choji, and others show his capacity for friendship and loyalty, which is the opposite of sociopathic behavior.
Naruto might become more observant of the people around him in relationships. Shikamaru is good at reading people, and if Naruto were to act like him, he'd notice the little details about his friends or love interests. He could be more in tune with their emotions and needs, which would make his relationships deeper and more meaningful. For instance, he'd be able to tell when someone is sad or stressed without them having to say it, and he'd act accordingly.
Well, it could lead to a lot of confusion. Shikaku might be surprised to see Naruto with Shikamaru. Maybe he'd start asking questions about what they were up to, whether it was some sort of training or just hanging out. It could also potentially create some comical moments as Shikaku tries to figure out their relationship in the context of the fanfic.