One popular one is 'Naruto: The Ultra Instinct Awakening'. In this fanfiction, Naruto discovers his Ultra Instinct during a life - or - death battle. It has great descriptions of his new power and how it affects his fighting style.
Another challenge is adapting his fighting style. Naruto's existing fighting style is based on his ninja training and the use of chakra. Ultra Instinct is a completely different concept. He has to figure out how to integrate the new power into his attacks and movements without losing his own identity as a ninja. For instance, he can't just abandon his signature Rasengan, but needs to find a way to use it in conjunction with Ultra Instinct abilities.
Often, it begins when Naruto has a moment of deep self - reflection. He realizes the limitations of his current power and starts to explore new ways to fight. In the context of the fanfiction, this exploration could lead him to the path of learning Ultra Instinct. For example, he might encounter a wise character who gives him some cryptic advice that sets him on this journey.
There are indeed Naruto fanfictions where he has Ultra Instinct. Fanfiction writers like to experiment with different power combinations. By giving Naruto Ultra Instinct, they can create really exciting battle scenes. For example, Naruto could use Ultra Instinct to dodge attacks more effectively during a fight with a powerful enemy like Madara, adding a whole new dimension to the story.
A common plot point is Naruto's initial struggle to control the ultra instinct. It's not easy for him to harness this new power, and we see him face setbacks and challenges in the fanfiction. For example, he might accidentally use it at the wrong time or struggle to maintain it during a fight.
One thing that could happen is that Naruto would become much faster in combat. Ultra Instinct gives the user incredible speed and reflexes. So Naruto could dodge attacks that were previously impossible for him to avoid. For example, he might be able to effortlessly avoid Sasuke's Chidori in a new and intense battle between them.
Yes, it can be a great concept. Combining Naruto's ninja skills with the Ultra Instinct concept from Dragon Ball can lead to some really exciting and unique storylines. Naruto already has his own chakra - based powers, and adding Ultra Instinct - like abilities would take his power level to a whole new dimension. It could also create interesting interactions with his friends and foes as they react to this new power.
One idea could be Naruto discovers a hidden ancient jutsu that unlocks his ultra instinct - like powers. He then uses these powers to quickly defeat enemies in the Fourth Great Ninja War, surprising everyone including Sasuke. Another could be Naruto training in a secret dimension where he gradually attains ultra instinct and has to face off against a new, powerful and unknown enemy that threatens the entire ninja world.