I'm not sure if there is such a specific fanfiction. There are countless Naruto fanfictions out there, and while the idea of Naruto being Kimimaro's brother is quite an interesting and unusual concept, it might not be a common one. You could try searching on major fanfiction websites like Fanfiction.net or Archive of Our Own to see if it exists.
In such a fanfiction, it might start with Naruto always feeling like there was something missing in his life. Then, through some strange turn of events, he discovers that he has a brother in Kimimaro. Kimimaro, on the other hand, could be conflicted as he has been raised in a very different environment in the Sound Village. Their journey together could involve them trying to understand each other's worlds, and also facing the challenges that come with their new - found family bond. There could be battles where they have to fight side by side, using their complementary abilities to defeat enemies.
I'm not entirely sure as the statement is rather unclear. It could potentially be about a fan - made story where Kimimaro, a character from Naruto, serves in some capacity within the narrative of the fanfiction. Maybe he serves a particular character, or serves a cause within the made - up story.
One possible scenario in this fanfiction could be that Naruto discovers Haku and Kimimaro in a dire situation. Haku, with his ice techniques, and Kimimaro, with his powerful bone abilities, are perhaps being overpowered. Naruto, being the hero he is, jumps into the fray. He may convince them to change their ways and join him in Konoha, as he once did with Sasuke. This would not only show Naruto's growth as a ninja but also his ability to bring out the best in others.
In some fanfictions, Kimimaro survives his illness and later crosses paths with Naruto during a major ninja tournament. They end up competing against each other in the tournament. Kimimaro shows off his new - found control over his abilities and Naruto uses his latest jutsu, leading to an intense and exciting battle.
If Naruto had Kimimaro's bloodline, his physical abilities would likely be enhanced. Kimimaro had great strength and speed, which Naruto could use to his advantage in combat. His ninja skills would be more diverse as Kimimaro's bone - related techniques could be added to Naruto's arsenal. Also, Naruto's endurance might increase, allowing him to fight longer and more effectively against opponents.
Their relationship could be one of mutual respect. Naruto respects everyone's potential for good, and Kimimaro, if given the chance in fanfiction, could respect Naruto's strength and determination. They might start off as strangers, but as the story progresses, they could form a bond. For example, Naruto could help Kimimaro find a new purpose in life after being used by Orochimaru for so long. And Kimimaro could be a valuable asset to Naruto in battles, using his bone - based jutsu to their advantage.
Well, Naruto and Kimimaro could start off as strangers who are forced to interact because of the saving situation. As time goes on, they discover that they both have a longing for a family and a place to belong. They would open up to each other about their past traumas. This sharing would create a deep emotional connection between them, and they would become close friends, supporting each other through future challenges.
One possible plot could be that Kimimaro, who was once an enemy, is resurrected in a strange way. Naruto, being the ever - optimistic and forgiving ninja, tries to understand Kimimaro's past and the pain that drove him to be Orochimaru's tool. They could end up training together, with Naruto teaching Kimimaro about the power of friendship and the will of fire. Kimimaro, in turn, could show Naruto some unique bone - related jutsu techniques and how to counter them, leading to a new bond between the two.
Their relationship could develop in a very brotherly way. Naruto would see Kimimaro as someone who needs help and guidance, just like he saw many of his friends in the past. He would teach Kimimaro about the value of life and the importance of protecting others. Kimimaro, in turn, would become very loyal to Naruto, protecting him when needed.
Unfortunately, I can't recommend any particular 'kimimaro serves naruto fanfiction'. However, you can also ask in Naruto - related fan communities or forums. There are many Naruto fans out there who might be able to point you towards some interesting fanfiction with that concept.