Well, it could be about Shinachiku exploring the hidden powers within him. Maybe he discovers a new jutsu that no one has seen before and uses it to protect the village from a mysterious threat.
In a 'boruto shinachiku world fanfic', potential characters would include Shinachiku's family members for sure. Naruto, being his father, would play an important role. Hinata as his mother would be there to support and guide him. Boruto would be his cool older brother. Besides, characters like Konohamaru, who is now a teacher, could also be in the story. He could train Shinachiku and help him grow as a ninja. Also, the friends that Shinachiku makes on his own adventures, new characters created specifically for the fanfic could be part of it.
Their relationship can be developed through shared experiences like going on missions together. When they face difficulties side by side, they'll learn to trust and rely on each other more.
A possible plot idea is that Shinachiku is targeted by a group of rogue ninjas who think he has some valuable information. Boruto then has to protect him while also trying to figure out what these rogues are after. Another aspect could be that Shinachiku wants to prove himself to Boruto by taking on a difficult task on his own, but gets in over his head and Boruto has to come to the rescue. There could also be a plot where they both go on a journey to find a rare ingredient for a medicine that is needed to save someone in the village.
Well, in this fanfiction, Shinachiku Uzumaki might show off some unique ninja skills that he's inherited. Maybe he and Boruto could go on an adventure together, like exploring an ancient, mysterious ninja temple filled with traps and hidden jutsu scrolls.
It could be a rogue ninja from a forgotten clan who has a vendetta against the Uzumaki. This antagonist might see Shinachiku as a threat because of his potential power and decides to target him and Boruto to stop them from achieving something great in the Hidden Leaf Village.
One great idea for a Boruto and Himawari fanfic is a story where they go on a journey outside the village. They might encounter new types of ninjas or strange creatures. Himawari could be the one to sense danger with her Byakugan first, and Boruto would be ready to fight. It would show their growth as ninjas and also their bond as siblings.
You can start by looking on fanfiction websites such as Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, and there's a good chance you'll find some 'shinachiku uzumaki fanfic' there.
There is a 'shinachiku uzumaki fanfic' that delves into his relationships with other characters in the Naruto universe. It explores how he interacts with his relatives and friends, adding depth to his character. For example, his bond with Naruto could be a central aspect, as Naruto is also an Uzumaki. This fanfic could show how Shinachiku looks up to Naruto and learns from him.
If Naruto dies in the fanfic, Boruto would likely face a great emotional turmoil. He would have to grow up without his father's guidance, which could make his journey to become a ninja even more challenging. Also, the Hidden Leaf Village would lose its strongest protector, which might lead to a sense of insecurity among the villagers.