Well, a frequent theme is Naruto's determination. He's shown as being really committed to his training in the cold. For example, he could be practicing new jutsu in freezing conditions. And there's often the theme of growth. His body and mind both grow stronger through this cold training. Maybe he starts to understand his chakra better in these harsh conditions. And sometimes, there's a theme related to his past. The cold training might be a way for him to deal with the memories of his lonely childhood, or to prove himself despite being an outcast in the beginning.
One common theme could be Naruto's extreme self - discipline. In these fanfictions, he might push himself to the limits in cold weather, like running barefoot in the snow to toughen his body. Another theme could be his isolation during this training. He may choose to train alone in a cold, desolate place, away from his friends, to focus solely on improving his skills. Also, there could be a theme of self - discovery. As he endures the cold and the hardships of training, he might learn more about his inner strength and capabilities.
Well, Naruto uses his ninja skills. He could find a sheltered spot to train in, like a cave, which offers some protection from the cold wind. Also, he may have learned some survival techniques. He could make warm drinks from local plants or animals if it's in a more wilderness - like setting. And of course, his physical strength and endurance play a big role. The more he trains, the more his body can adapt to the cold.
In 'naruto trains himself fanfic', one interesting scenario could be Naruto finding a secluded waterfall area to train his new jutsu. He spends days there, facing the force of the water as he tries to perfect his chakra control. Another scenario might be Naruto training with shadow clones in a dense forest, pushing his limits as he spars with multiple versions of himself.
One common theme is power growth. Naruto's development of new skills under the fem Kyuubi's training is often explored. Another is the relationship aspect, like whether they become friends or something more. And there's also the theme of self - discovery for Naruto as he learns more about himself through the training.
One common theme is revenge. If Naruto is cold and calculating, he might be seeking revenge for something that happened to him or his village. Another theme could be power - hungry Naruto, where his calculating nature is focused on gaining more power in the ninja world.
One common theme is the transformation of Naruto. Through Kabuto's training, Naruto often becomes more versatile in his skills. Another theme is the exploration of Kabuto's motives. Why does he train Naruto? Is it for personal gain or some greater good?
Friendship is a common theme. Since both Ichigo and Naruto value their friends highly, fanfictions often explore how they form new bonds in crossovers.
In some fanfictions, Asuma might train Naruto in stealth and strategy. For example, he could set up mock battles where Naruto has to outwit his opponents using clever strategies rather than brute force. This type of training would add a new dimension to Naruto's ninja skills.
There could be a fanfiction where Kakuzu trains Naruto in dealing with his chakra in a more efficient way. Since Kakuzu has unique abilities related to his chakra and his multiple hearts, he could pass on some knowledge to Naruto about conserving and using chakra better. For example, he might show Naruto how to distribute chakra evenly throughout his body for faster movement or stronger attacks.
One interesting fanfiction could be 'Minato's Training Legacy'. In this, Minato imparts his unique jutsu knowledge to Naruto in a very detailed and creative way. It might show Minato teaching Naruto how to better control his chakra for the Rasengan, just like he did in the original series but with more in - depth exploration.
There could be a fanfiction where Danzo trains Naruto after realizing that Naruto's unique chakra and ability to make friends could be harnessed for the Root's purposes. However, Naruto being Naruto, he would try to influence Danzo to use these skills in a more positive and moral way, leading to an interesting dynamic between the two characters.