In a fanfic, they could face challenges related to their goals. Sayo Hitsugi might have a personal goal that conflicts with Naruto's mission to protect the village. For instance, if Sayo Hitsugi is seeking revenge against someone who is also important to the village's stability. They would have to find a way to reconcile their different goals without sacrificing their friendship or the greater good.
One challenge could be communication. If they come from different backgrounds or cultures within the fanfic world, they might have trouble understanding each other at first. For example, if Sayo Hitsugi has a very formal and traditional way of speaking and Naruto is his usual brash self. Another challenge could be trust. Naruto has been betrayed before, so he might be hesitant to trust Sayo Hitsugi right away, and vice versa. They would need to overcome this to work together effectively.
A plot could involve a time - travel scenario. Sayo Hitsugi somehow gets sent back in time and meets a younger Naruto. Together, they try to change certain events in the ninja world's history that could have a major impact on the future. Or perhaps there is a plot where Naruto has to protect Sayo Hitsugi from a group of rogue ninjas who are after her for some unknown reason. Naruto's loyalty and determination to protect his friends would be put to the test.
Sasuke might face the challenge of understanding baby Naruto's needs. Since he's not used to dealing with infants, things like feeding, changing diapers could be really difficult for him.
He might face powerful enemies. For example, if the enemies are from a secret organization with strong and unknown jutsu, Naruto would have to quickly figure out their weaknesses. This could be difficult as he has no prior knowledge of them.
One challenge could be Naruto's impulsive nature. He often rushes into things without thinking, and Tsunade would have to find a way to rein him in. Another might be dealing with Naruto's fame. Since he is the Jinchuriki of the Nine - Tails, he has a lot of attention on him, and Tsunade would need to protect him from those who might want to use or harm him.
One challenge could be adapting to the team's dynamics. Team 8 has its own way of operating, and Naruto is used to his own style with his friends. For instance, they might be more methodical in their planning, while Naruto is more of a 'jump - in - and - figure - it - out' type. So, he'd have to learn to follow their lead sometimes.
In the 'naruto wants to be promoted' fanfic, Naruto may struggle with the traditional ways of the village. His unique approach to being a ninja, which often involves thinking outside the box, might not be fully understood or accepted by the old - school ninja leaders. This lack of understanding could lead to resistance against his promotion. Additionally, he may have to deal with false accusations. Some might spread rumors about him to prevent his rise in rank, and he'll have to prove his innocence and worthiness for promotion.
One challenge could be acceptance. Naruto has always been known as a boy in the village, and suddenly becoming a girl might make some people distrust or be suspicious of him. Another challenge is physical. His fighting style might need to be adjusted as his body is now different. Also, he might face different social expectations that he's not used to.
He might face challenges like finding the right place to plant the tree. Konoha has a lot of regulations about what can be planted where. Also, he needs to make sure the tree gets enough water and sunlight. If it's a magical tree, he may not know exactly what it needs to grow well.
One challenge could be controlling the power of the Juubi. It's an incredibly powerful and chaotic force. Naruto would have to struggle to keep it in check so that it doesn't overwhelm him and cause him to lose control. If he loses control, he could end up harming his friends and allies instead of protecting them.
One challenge could be dealing with competitors. If his company is in a competitive field like ninja training, there might be other established companies or individuals who see him as a threat and try to undermine his business.