He would face the challenge of being physically weaker. As a kid, his strength and agility would be reduced, so he might struggle to perform the acrobatic feats and super - strong punches he's known for. This could make it difficult for him to fight villains effectively.
Another challenge would be hiding his identity. His normal appearance as Spider - Man is very different from when he's a kid. He would need to find new ways to keep his secret, and also convince his friends and allies that he's still the same Spider - Man. Plus, villains might not take a kid seriously at first, but could quickly realize his potential and target him more aggressively.
One big challenge could be that the Avengers might try to over - protect him. They might not let him go on as many dangerous missions, which Spider - Man might see as holding him back. Also, he has to deal with school and normal kid stuff on top of being a superhero. If his identity gets out among the Avengers, there's also the risk of it getting out to the bad guys too.
Momonga would also face challenges in terms of adapting to the human lifestyle. He has to deal with things like finding shelter, getting food, and maintaining his health. In the game world, these aspects were not really relevant in the same way. He might not even know how to cook or find a proper place to live. And he would have to learn about money and how the human economy works, which is a whole new and complex system for him.
Spider Man would probably be very protective. He'd use his agility and strength to keep the kid out of danger. For instance, if they were in a fight scene, he'd quickly web - sling the kid to a safe place.
In fanfiction, if Spider - Man turns into Venom, he might initially struggle with the new, darker impulses. Venom's symbiotic nature could make him more aggressive. He could find it hard to control his actions, like being more prone to using excessive force against villains. His relationships would also change. His friends might be scared of him at first, and he'd have to prove that he's still the good guy inside.
He may also face challenges in his relationships. His spider - like behavior might make it difficult for him to interact with his friends and family in a normal way. For instance, if his spider - sense is constantly on high alert, he might seem jumpy or distracted, which could strain his relationships.
Naruto would also have to deal with the physical differences. As a girl, she might not have the same physical strength she had as a boy. This could be a big issue in combat situations, as she would need to adapt her fighting style. Maybe she would have to rely more on agility and strategy rather than brute force.
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 possibility is that he gets betrayed by those he trusted most, like his friends or the city he protects. This betrayal could plant seeds of anger and resentment, gradually turning him evil. For example, if the public blames him for something he didn't do, he might start to think that they don't deserve his protection.