Well, Naruto could use his telekinesis powers in combat. He might be able to disarm his opponents without even touching them. Just by using his mind, he could send their weapons flying. For example, against Sasuke, he could stop Sasuke's sword attacks mid - air and then take the sword away from him. It would be a huge advantage in battles.
His relationship with Sakura might change. Sakura would be even more impressed with Naruto having this new power. She might see him as an even greater ninja and could potentially develop stronger feelings for him. Naruto, on the other hand, might use his telekinesis to do small things for Sakura, like picking flowers for her without having to touch them.
Well, it could be that Naruto gets some kind of elemental powers from the comet. Maybe the comet is associated with a new, rare element that Naruto can then manipulate. This new power could give him an edge in battles, as his opponents would be unfamiliar with it. He could use it in creative ways, like combining it with his existing jutsu to create even more powerful attacks.
Well, he'd probably be even more of a badass. His already formidable combat skills combined with Wolverine's healing factor and adamantium claws would make him nearly unbeatable. He could take on stronger foes without worrying much about getting hurt. And his speed and agility from his ninja training, along with Wolverine's berserker rage, would create a really interesting and powerful character in the fanfiction world.
Well, Naruto would become extremely powerful. His combat abilities would likely be enhanced with the unique powers of arrancars. He could gain new forms and techniques. Maybe he'd have a zanpakuto-like weapon with special abilities, which would add a whole new dimension to his fighting style. Also, his speed and strength might increase exponentially, making him even more of a force to be reckoned with in the Naruto universe.
Well, if Naruto gets Shinigami powers in a fanfiction, he could potentially gain the ability to manipulate souls. He might be able to use the Shinigami's scythe in combat, which would be a really cool and unique weapon. Also, he could have new forms of jutsu related to the soul realm.
Some fanfictions might give Naruto the power of elemental fusion. He could combine fire, wind, water, earth, and lightning in ways that are not possible in the original series. This would make his attacks extremely powerful and unpredictable. For instance, he could create a storm of lightning - infused water that not only electrocutes his enemies but also drowns them.
He would become more confident. Having telekinesis would give him an edge in battles and make him feel more in control. For example, he wouldn't have to rely solely on his physical strength or ninjutsu. This new power could also make him more responsible as he realizes the potential harm it could cause if misused.
His relationship with Sasuke could change. Sasuke might be initially jealous of Naruto's new power. But as they face challenges together, Sasuke could come to respect it. For example, if Naruto uses telekinesis to save Sasuke from a dangerous situation, Sasuke would see the value of it.
Well, Naruto getting the Seven Deadly Sins powers would likely change his relationships. His friends might be a bit wary of him at first, especially if he got the power of Envy. He could start to envy others' skills or powers in a way he never did before. But on the other hand, if he had the power of Kindness (the opposite of some of the sins), he could use it to bring out the best in his friends and foes alike.