For Goku's relationship with the other Z - Fighters, it could be a mixed bag. Some, like Piccolo, might see the tail as a potential weakness that enemies could target. So he might be constantly on Goku to protect it. On the other hand, Yamcha might be jealous that Goku has this unique feature that makes him stand out even more. However, overall, Goku's tail could also be a unifying factor. It could remind them all of Goku's alien origin and make them more aware of the vastness of the universe and the different species within it, which could strengthen their bond as a group.
Well, if Goku keeps his memory in fanfiction, it could strengthen his relationships. For example, with his friends like Krillin, he'd be able to recall all their past adventures more vividly. He could offer better advice based on past experiences, making their bond deeper. Also, with his family, he'd be more present in their lives, remembering important events in their relationships, which would lead to more meaningful interactions.
Well, Goku's new - found intelligence can sometimes be a bit of a surprise to his friends. At first, they might be a bit skeptical or even a little intimidated. But as they see how he uses it to help them, it can bring them closer. For example, if he uses his smarts to figure out how to get to a new training ground that's really beneficial for everyone. His relationship with Vegeta could also change. Instead of just being rivals in strength, they could start to have more intellectual battles or discussions about strategy.
One interesting plot could be that Goku's tail gives him a new power. Since it's always been a unique part of him, perhaps it allows him to communicate with a certain race of creatures that are only attuned to the energy his tail emits. Another plot could be that he has to protect his tail from an enemy who wants to use it for some dark magic. The enemy believes that Goku's tail holds the key to unlocking a powerful spell, so Goku has to constantly be on guard while still going about his normal adventures.
His tail might enhance his combat abilities in a few ways. Since Goku is part Saiyan and Saiyans are known for their agility, the tail could be an extension of that. He could potentially use it to sense movements around him, much like how some animals use their tails for that purpose. In combat, this could give him an edge in predicting attacks and reacting faster. Also, he could use it for quick strikes, like a whip, adding an unexpected element to his fighting style.
In such a fanfiction, Naruto keeping to himself might make others initially find it hard to approach him. For example, his friends like Sasuke and Sakura might be a bit confused at first. Sasuke, who is also a bit of a loner in his own way, might not know how to deal with this new Naruto. Sakura, on the other hand, might try harder to break through his shell. This could lead to some strained relationships at the start, but as the story progresses, those who truly care about Naruto would try to understand him better and build deeper, more meaningful relationships with him.
It would greatly affect his relationship with Sakura. She might be scared at first, seeing Naruto with such a powerful and dangerous force. But if Naruto manages to control it, she could grow to respect him even more. With Sasuke, it could be a different story. Sasuke might see Naruto's new - found power as a challenge or a threat, which could either drive them further apart or lead to a more intense rivalry where they both strive to become stronger in different ways.
For his friends in Team 7, Sakura would be initially shocked but then try to find medical ways to help Naruto if the tail causes any discomfort or problems. Naruto's new state might also attract the attention of Hinata, who would be even more shy around him but also very supportive. And with the villagers, those who once feared or hated him might start to see him in a new light as this unique development could be seen as a sign of his growing power and importance.
Well, his friends might start to feel like he's drifting away. Since he's hiding his strength, he can't fully participate in training or battles as they expect. For example, Sakura might think Naruto is being lazy or not trying hard enough, which could create some tension between them.
His malnourishment could make his friends worry more about him. For example, Sakura might start to be more motherly towards Naruto, constantly trying to get him to eat proper meals. His relationship with Sasuke could also change as Sasuke might initially look down on Naruto for being weak because of the malnourishment, but then as he sees Naruto's determination to overcome it, he gains a new respect for him.
His relationship with his friends like Ned and MJ could become strained. They might not understand why he's so distant all of a sudden and why he always seems to be in a hurry. Peter would be constantly worried about them finding out he's homeless and might push them away to protect his secret.