Jiraiya is often a common character. Since he was Naruto's teacher and had knowledge of sage training himself, he might appear in the fanfiction to guide Naruto further. Another one could be Kakashi. He is always looking out for Naruto and could be involved in the training in some way, like providing strategic advice.
One interesting plot could be Naruto exploring new and unique sage training methods that are not in the original story. For example, he might discover a hidden sage realm with different rules and challenges.
Obviously, Naruto is the central character. But there are also often other characters like Jiraiya. Since Jiraiya was Naruto's mentor in the original story and had knowledge about sage mode, he often appears in fanfics to guide Naruto in his training. Another common character could be Kakashi. He may offer some advice or support to Naruto during the training process.
In certain 'naruto sage training fanfic', there could be a plot where Naruto's sage training is intertwined with a prophecy. He has to train in a specific way to fulfill the prophecy and save the ninja world. This could lead to him having to master skills and powers that are far beyond what he originally thought possible during his sage training journey.
Well, in a fanfiction like this, it could explore Naruto's sage mode abilities in a new context while he's with Yugito who has also been banished. Maybe they form an alliance to fight against the forces that banished them. They could discover new powers together and change the shinobi world's view of them.
In this fanfiction, Hokage Naruto might take Naruto to a special training ground. There, he could teach Naruto some of his own unique jutsu combinations. For example, he could show Naruto how to combine the Rasengan with his Sage Mode more effectively. This would give Naruto a huge power boost and also make him more confident in battles against tougher opponents.
In this fanfiction scenario, Naruto might learn unique chakra control techniques from Sarutobi. Sarutobi, being an experienced ninja, could teach Naruto how to better manage his large chakra reserves. This would lead to Naruto being able to perform jutsus more efficiently and with less waste of chakra.
Perhaps he's been influenced by someone who gives him bad advice. For example, if someone tells him that natural talent is enough and training is overrated. Also, he could be dealing with some personal problems, like a conflict within his family or among his friends that takes up all his time and mental energy, causing him to neglect training.
Well, it could be that the three of them are training Naruto for a big upcoming battle. Temari focuses on Naruto's physical combat skills, teaching him how to better use his speed and strength in combat. Yugito delves into the more spiritual side of chakra, guiding Naruto to connect with his inner power. Naruto, under their tutelage, not only hones his skills but also forms a strong bond with Temari and Yugito. This bond might be crucial in future challenges that Naruto will face in the fanfiction world.
Well, in the 3 - year training fanfiction, Naruto could also have some intense mental growth. He might learn more about the history of his clan and the ninja world from Jiraiya. This knowledge would not only make him a better ninja but also shape his understanding of his place in the world and his responsibilities.