His singing ability would likely change his relationships in multiple ways. For the devils in his peerage, it could be a source of pride as he becomes known for this unique talent. They might promote his singing, which would increase his visibility in the supernatural community. For the female characters, it could be a romantic draw. His singing could be a way for him to express his emotions in a more nuanced way than just through his actions in battles. For those who are initially skeptical of Issei, like some of the more traditional devils, his singing could be a way to break down barriers and gain their respect as they see him as more than just a typical reincarnated devil.
In relationships with potential love interests, his coldness can be a major obstacle. If he was previously a warm and friendly person towards a girl he liked, the sudden coldness could make her think he's no longer interested. This can create a lot of misunderstandings and drama in the fanfiction.
With his friends like Sakura and Kakashi, they might be initially confused but then supportive. Sakura could be worried that Naruto is getting involved in something dangerous related to the moon, but also trust that he knows what he's doing. Kakashi, on the other hand, would likely be more intrigued and offer his wisdom and guidance as Naruto explores this new aspect of his life.
If Snape was an Animagus, it could make his relationship with Harry even more complex. Harry might be initially distrustful of Snape's Animagus form, seeing it as another way for Snape to spy on him. However, as time goes on, he might come to understand that Snape's Animagus ability is also used for other purposes, like protecting Hogwarts in a different way.
His relationship with Sasuke would be greatly affected. If Naruto could control time, he might be able to show Sasuke what the future could be like if they worked together instead of being enemies. This could potentially heal their fractured relationship much faster. With space - control powers, Naruto could quickly reach Sasuke whenever he was in trouble, strengthening their bond of friendship.
His relationship with Annabeth would likely change. She might be both in awe and a bit worried about his new powers. For example, if Percy can now control wild animals, she might be concerned about how he uses that power in battle. On the other hand, Grover would be extremely excited. Grover has always had a connection with nature and animals, and now Percy being the god of animals would make their bond even stronger. They could go on more adventures together, exploring hidden animal habitats.
It could change his relationship with his enemies too. Enemies might be more hesitant to attack him, not knowing what the mouths on his hands can do. Some might be so freaked out that they avoid him altogether. His relationships with his sensei, like Jiraiya, would be interesting. Jiraiya would likely be excited to study this new phenomenon and help Naruto figure out how to use it to his advantage. And Naruto's new 'hand - mouths' could also bring him closer to some characters who are interested in the strange and unusual in the ninja world.
Well, it often makes others suspicious of him. Some might think he's up to no good or even evil because talking to snakes is associated with dark magic in the wizarding world. For example, his classmates could be afraid or distrustful, like when they first found out about it.
Well, his friends might be in awe of him at first. Some, like Sakura, could be a bit jealous of this new power he has. But Naruto, being Naruto, would probably use it to protect his friends more effectively, which could strengthen his bonds with them in the long run. His enemies, on the other hand, would be more cautious around him, seeing him as an even greater threat.
As for his relationship with Kakashi, Kakashi would likely see the potential in Naruto's ink bloodline limit and start to train him in new ways. He could help Naruto develop his ink - based jutsu and incorporate it into his overall fighting style. This would strengthen their teacher - student relationship as they explore this new aspect of Naruto's power.
It would change his relationships a lot. His friends like Sakura and Sasuke would be both intrigued and maybe a bit worried. Sasuke, who has his own Sharingan, might see Naruto as more of a rival now. Sakura would be concerned about the risks of the implantation. And his relationship with Kakashi would also shift. Kakashi could help Naruto better understand and control the Sharingan, creating a stronger bond between them as teacher and student.