His personality might become more somber. Having the Shinigami inside him could make him more aware of death and the finality of things. He might be less reckless in battles as he now has a constant reminder of the seriousness of death.
Naruto's personality could be deeply affected. He might develop a more solemn side, as the Shinigami's presence is a heavy burden. He could become more introspective, constantly thinking about the balance between life and death. This might also make him more empathetic towards those who have lost loved ones, as he has a closer connection to death himself.
Well, he might gain some spooky powers. Maybe he could use the Shinigami's abilities to sense death or even communicate with the dead. It could also put him in a really dangerous situation, as the Shinigami's power might be too much for him to control at first.
Well, it could enhance his powers in many ways. The Shinigami is a powerful entity, so Naruto might gain some death - related abilities. Maybe he could sense the presence of death more acutely, or have the power to temporarily 'kill' an opponent's abilities. For example, he could send out a sort of death - like energy that freezes an enemy's chakra for a short time.
If the Shinigami is sealed in Naruto in fanfiction, his character development would be a wild ride. At first, he might be scared and confused by this new power. But as time goes on, he would start to explore it. He would become more brooding as he tries to understand the nature of the Shinigami's power. His sense of justice might also be challenged as the Shinigami's power might not align with his normal ninja values. He would have to find a way to incorporate this new power into his life without losing his identity. This could lead to some really deep character growth, as he grapples with the duality of his own power and the power of the Shinigami.
Naruto's friendly nature might be at risk. Majin Buu's more violent and self - centered tendencies could seep into Naruto's mind. He might have moments where he's more aggressive towards his enemies than before. But Naruto's core of kindness might still try to shine through, leading to an internal battle between his own self and Buu's influence.
Well, Naruto could face several consequences. Firstly, the sheer amount of chakra from all the bijuu might put a strain on his body. He could experience physical exhaustion or even harm to his internal organs. Psychologically, he might have to deal with the voices and personalities of all the bijuu in his head. This could be a real challenge for him, as some of the bijuu might have conflicting natures. Also, in terms of his relationships, some people might fear him or be jealous of his new power. This could lead to a strain in his friendships and alliances. And from a political perspective, other ninja villages might see him as a threat and try to either control or eliminate him.
I'm not entirely sure if there is a specific fanfiction with exactly that premise. However, given the popularity of both Naruto and the concept of sealing powerful entities in Naruto's world, it's quite possible. Fanfiction writers love to experiment with combining different fictional elements, so it wouldn't be surprising if someone has written a story where Jenova is sealed in Naruto. You can try searching on popular fanfiction websites like Fanfiction.net or Archive of Our Own to find out for sure.
In many such fanfictions, it could be a variety of deities. It might be an ancient and powerful god from Naruto's world's mythology that the story's author has chosen to insert. For example, it could be a god of elements like a super - powerful fire god, which could give Naruto even more control over his existing fire - based jutsu and new, more extreme abilities related to fire.
Well, Naruto might become more mysterious. Since Gaster is an unknown and rather enigmatic entity, Naruto could start having strange thoughts or powers that he doesn't fully understand at first. He might seem more withdrawn as he tries to figure out what's going on inside him, and his normal cheerful and straightforward personality could be clouded by the presence of Gaster.
In a fanfiction with Naruto having Frieza sealed in him, there would be a clash of cultures too. Naruto comes from a world of ninjas with honor and teamwork, while Frieza is a tyrant from a universe where power rules all. Naruto would have to find a way to balance Frieza's power without losing his own values. His training would take a whole new turn as he tries to master Frieza's power. And there could be a lot of internal conflict as Naruto battles with Frieza's consciousness inside him, trying not to let Frieza take over his body.
He'd probably be more solemn. The Shinigami is a being associated with death, so Naruto would be exposed to serious concepts early on.