A plot twist could be that Urahara's training makes Naruto lose his ability to use shadow clones for a while. This forces Naruto to rely on other skills he's learned from Urahara, like swordsmanship or some new type of jutsu. It would also make his friends and enemies question his power and how to deal with this new Naruto.
One possible plot twist could be that Zabuza's training methods lead Naruto to develop a darker side. Naruto might start to question his own values as Zabuza's more ruthless ways of fighting seep into his mindset. For example, he could become more willing to use underhanded tactics in battles, which would shock his friends.
One possible plot twist could be that Dante's training methods are so unorthodox that Naruto initially struggles to adapt. For example, Dante might focus on swordsmanship which is completely different from Naruto's usual ninja skills. This could lead to Naruto having to re - evaluate his understanding of combat and power. Another twist could be that Dante has a hidden agenda in training Naruto. Maybe he needs Naruto to face a powerful demon in the Naruto universe that has some connection to the demons in his own world. And finally, Naruto's chakra might interact in unexpected ways with Dante's devil - may - cry powers, creating a new and unique form of power for Naruto that no one could have predicted.
One possible plot twist could be that Tsunade trains Naruto not just in physical combat like she did with others, but also in medical ninjutsu. This would be unexpected as Naruto is more known for his brute force. Maybe Naruto uses his new medical skills in a creative way during a battle, like healing his opponents to show mercy and then defeating them when they are off - guard.
A plot twist could be that Slade has an ulterior motive for training Naruto. Maybe he plans to use Naruto as a weapon against Konoha in the future. He might be secretly feeding information about the village's defenses to an enemy while training Naruto. So, when Naruto discovers this, he has to find a way to stop Slade and also deal with the fact that he has been unknowingly part of a scheme against his own home.
One possible plot twist could be that Mikoto discovers Naruto has a hidden kekkei genkai that she helps him unlock. This new power could completely change Naruto's abilities and how he's perceived in the ninja world.
One possible plot twist could be that Sakumo's training methods are very unorthodox compared to what Naruto is used to in the village. For example, he might focus more on stealth and assassination skills which Naruto initially struggles with as he is more used to head - on combat. Another twist could be that Sakumo has a hidden agenda for training Naruto, like he is preparing Naruto for a specific threat that he foresees but hasn't shared with the village yet.
One possible plot twist could be that Naruto, under their training, discovers a new form of chakra that combines the Senju and Uchiha powers in a unique way. This new power might make him a target for other hidden villages who fear his new - found strength.
One possible plot twist could be that Danzo, despite being 'good', has a hidden agenda related to Naruto's power. Maybe he wants to use Naruto to gain political influence in the Hidden Leaf. Another twist could be that Naruto discovers Danzo's past misdeeds while being trained, which creates a moral dilemma for him. He has to decide whether to continue training under someone with a dark history or break away.
Another plot twist could be that Obito is secretly training Naruto to fight against an even greater enemy that no one else is aware of yet. This enemy could be an ancient force that is about to awaken, and Obito believes Naruto is the only one who can stop it. So, he's training Naruto in unique and unorthodox ways that seem strange to others at first.
One possible plot could be that Naruto somehow travels to the Bleach universe and meets Urahara. He is so impressed by Urahara's intelligence and his unique abilities, like his swordsmanship and his scientific inventions, that he becomes a big fan. Naruto then tries to learn from Urahara, and Urahara in turn might see Naruto's potential and start training him in new ways.