He would face challenges in making friends. Some kids might be afraid or hesitant to be around him because of his paralysis. Also, in a world where battles are common, he would be seen as a liability in combat situations. However, Naruto could use his charm and determination to break through these barriers and form strong bonds with others who see his true potential.
One major challenge would be acceptance. The ninja world is built around chakra, and without it, Naruto might be seen as a failure or an oddity. He'd also face difficulties in combat. Most of the ninja techniques rely on chakra, so he'd have to find alternative ways to defend himself. Another challenge would be his self - esteem. Growing up without chakra in a chakra - centric society could make him feel inferior.
In fanfiction, if Naruto goes to Kiri, he would face challenges related to the village's internal politics. There could be different groups within Kiri with their own agendas, and Naruto's presence might disrupt the balance. He might also struggle with the language barrier or cultural differences. For example, some of Kiri's traditions might be completely foreign to him, and he could accidentally offend someone. And of course, there are always the powerful and dangerous missing - nin from Kiri that he could run into.
He would face a huge ideological challenge. Madara has very extreme views about power and the ninja world order, which are completely different from Naruto's beliefs in friendship and cooperation. Naruto would constantly have to struggle not to be swayed by Madara's ideas.
He would face political challenges. Naruto is used to the relatively straightforward hierarchy in the ninja world. As a daimyo, he has to deal with complex political intrigue among the nobles and different factions. For example, there could be groups vying for power and trying to manipulate him.
One major challenge would be survival. Outside the village, he no longer has the support system of the Hidden Leaf. He'd have to find food, shelter, and deal with potential attacks from other shinobi or bandits. For example, in the wild, he might struggle to find clean water and safe places to sleep.
She would face challenges in how she's perceived. Her old friends might unconsciously treat her differently, which could make her feel isolated at times. In terms of her ninja training, she might have to adapt to new training methods suitable for a female body. And she'd also have to deal with the unwanted attention from some male characters who might see her as just a girl now, not the powerful ninja she was as a boy.
One challenge could be being taken seriously. Since he's younger, others might underestimate his skills and determination. Another would be having to grow up faster in some ways. He'd have to prove himself more quickly.
One challenge would be dealing with students who don't respect his authority. Naruto was always a bit of a rebel himself, so he might find it hard to enforce strict rules. Another challenge could be teaching complex ninja techniques to students with different levels of ability.
One challenge is mastering the Sharingan's abilities. Since Naruto is not an Uchiha, he doesn't have the natural affinity for it. He would have to learn from scratch how to activate it, control it, and use its powers like the Sharingan - enhanced perception and the ability to copy jutsu. Another challenge could be dealing with the potential side - effects. The Sharingan can be a strain on the user's eyes and chakra. Naruto already has the Nine - Tails' chakra which can be unstable at times. Combining the two could be a tricky balance.
Naruto would have to constantly protect the demon from other ninja who might want to kill her. This would put a strain on his relationships with his friends and comrades who might not agree with his decision.