I'm not sure specifically as I haven't read that exact fanfic. But generally, it might be about a character named Naruto Namikaze in the Kumo (presumably Kumogakure, the Village Hidden in the Clouds) setting. It could involve his adventures, relationships, or his role in the village's affairs.
Naruto might meet some young and talented Kumo ninjas. They could be eager to test their skills against Naruto or learn from him. Maybe there are some unique characters like a Kumo ninja with a special bloodline limit that Naruto has never seen before.
In the 'naruto goes to kumo fanfic', Naruto could be on a mission in Kumo. He might make new friends or enemies. He could also learn new jutsu from the ninjas in Kumo. It could be a great opportunity for him to grow as a ninja and expand his understanding of the ninja world.
In such a fanfic, Naruto might be subjected to various interrogations by Kumo. They could be interested in his Nine - Tails power. Maybe they would try to extract information about Konoha's secrets through him.
Well, in some 'naruto kumo fanfic', there are tales of a Kumo ninja with a unique kekkei genkai who joins Naruto in his quest to bring peace. This ninja has special powers that help them in battles against the Akatsuki. Also, there are fanfics that focus on the training regimes in Kumo and how they differ from Konoha's. Some stories might show Kumo ninjas competing in the Chunin Exams held in Konoha, which can lead to some interesting rivalries and friendships.
Typically, it would involve Naruto and the concept of a kumo seal master. There might be a focus on unique sealing techniques related to the kumo style. It could also explore the relationships Naruto has with characters who are involved with or knowledgeable about these seals.
Power and growth are common themes. Kumo ninjas are often depicted as striving to become more powerful, both physically and in terms of their ninja skills.
One possible scenario in such a fanfic could be that Naruto's upbringing in Kumo gives him a different perspective on chakra control, which aids him in learning Fuinjutsu. He might be trained by Kumo's elite ninjas who are experts in sealing techniques.
Naruto could meet the Raikage in this fanfic. The Raikage, being the leader of Kumo, would surely take notice of Naruto's arrival. They might start off on a tense note, as Naruto is from a different village, but later develop an understanding.
You could try searching on popular fanfic websites like FanFiction.net or Archive of Our Own (AO3). They have a large collection of Naruto - related fanfics and there's a good chance you'll find the 'naruto namikaze of kumo fanfic' there.