In fanfiction, when Naruto has the full Kyuubi, he often gains enhanced physical strength. He can deliver more powerful punches and kicks. His speed also increases significantly, allowing him to move so fast that his opponents can barely keep up.
Maybe through some kind of special training or a unique ritual. It could be that he discovers a hidden method within the ancient scrolls of his village.
Well, in the 'naruto gains kyuubi's powers fanfiction', Naruto might face new challenges as well as new opportunities. On one hand, he would be a target for those who fear his new - found power. On the other hand, he could use this power to protect his village better. He might also develop new techniques that are a combination of his own skills and the Kyuubi's power, like a new type of shadow clone jutsu infused with the Kyuubi's chakra.
In some fanfictions, when Naruto has the Kyuubi extracted, he often becomes extremely weak. His life force is severely depleted as the Kyuubi was a major source of his power. He may also face psychological trauma from losing such a huge part of himself that had been with him since birth.
Well, in Naruto fanfiction, the Kyuubi often has the power of destruction. It can unleash huge amounts of raw chakra that can level mountains or create massive shockwaves. The Kyuubi's power can also be used for healing in some fanfictions. Since it has such a large amount of chakra, it can be used to heal the jinchuriki's wounds, even from near - fatal injuries. Also, in certain fan - made stories, the Kyuubi has the ability to communicate telepathically with the jinchuriki, providing wisdom and knowledge from its long existence.
His temper might be more volatile. The Kyuubi's influence could make him quicker to anger, especially when someone threatens his friends or the village. However, he also has better control over his emotions in other cases as he has to manage the power of the Kyuubi. He can't let his emotions run wild all the time. He might be more withdrawn in some aspects, spending time to understand and control the new power within him, rather than being as outgoing as he was before.
One potential risk is losing control. The Kyuubi's power is wild and Naruto might find it difficult to keep his sanity while using it.
One popular plot is Naruto using the Kyuubi's power to protect Konoha from a new, powerful enemy. For example, he might face off against a group of rogue ninja who have united to take over the Hidden Leaf. Another plot could be Naruto exploring the memories of the Kyuubi, which leads to him learning ancient ninja secrets. This could involve finding lost jutsu or understanding the history of the ninja world better. Also, some fanfictions might have Naruto using the Kyuubi's power to finally bring peace between the ninja villages by showing his overwhelming strength and his will for peace.
It could be a fantasy light novel where the power gained through kissing is a unique magical ability. Maybe it's part of a hidden world or a special curse.
He might gain enhanced physical strength. The curse mark could boost his already impressive taijutsu skills, allowing him to deliver more powerful punches and kicks.
When Naruto has full control of the Kyuubi in the fanfiction, it changes his relationships in multiple ways. His relationship with Kakashi becomes more of an equal partnership. Kakashi no longer has to worry about Naruto losing control. With Hinata, she may feel even more admiration for him as he has tamed such a powerful force. For the other ninja clans in the village, they may start to approach Naruto to learn from his control over the Kyuubi. This new - found status also gives Naruto more influence in the village's politics and decision - making, as his power is now seen as an asset rather than a liability.