Perhaps in the fanfiction, as brothers, they have to face a common enemy that is specifically targeting their family line. This would make them rely on each other's unique abilities. Naruto's never - give - up attitude combined with Neji's precision could lead to some epic battles.
Another plot could be that they start to explore their family history together. They find out secrets about their parents and ancestors that not only change their view of their own clan but also give them new powers or a new purpose in life. For example, they might discover a hidden dojo or a long - lost technique that was meant for their family line.
One idea could be that Neji discovers a new hidden power within Naruto that he helps Naruto master. This could lead to them having to face a new, powerful enemy together.
One idea could be a story where Neji and Tenten go on a special mission together. They face many challenges and in the process, Neji discovers a new side of Tenten's strength. Maybe she uses some unique weapons or techniques that Neji has never seen before, and he gains a new respect for her.
Well, a great plot could be that Kakashi, being Naruto's brother, decides to train Naruto in some super - secret jutsu that only their family knew. This would give Naruto an edge in battles and also strengthen their bond. Or perhaps they get into an argument over their different views on the village's future, but in the end, their brotherly love prevails. It could also be interesting if they both have to protect a precious family heirloom from villains who want to use it for evil.
One plot idea could be a story where Sakura and Neji are paired on a mission in a foreign land. They have to rely on each other's skills to survive and in the process, they discover new aspects of each other's personalities. For example, Sakura's medical skills might save Neji from a deadly poison, and Neji's Byakugan helps them avoid hidden traps.
One idea could be that the Kurama brothers have a secret mission to protect Naruto from an ancient evil that only they know about. They use their unique powers and knowledge to train Naruto in ways that no one else can.
Perhaps they could start off not knowing they are brothers. Naruto is in his ninja world and Goku is in his. Then, a strange rift in the dimensions brings them together. They realize their connection when they notice similar powers or markings. After that, they train together and combine their unique skills, like Naruto's shadow clones with Goku's ki attacks, to face challenges in both worlds.
A possible plot could be that Sakura discovers a new medical ninjutsu that has some unexpected side effects on Neji and Sasuke's chakra. This causes them to have to work together closely to figure out how to reverse the effects. Or perhaps there is a prophecy that only Sakura, Neji and Sasuke together can fulfill, which involves facing a powerful and ancient evil that has been awakened.
One idea could be that they grow up with a new sense of family loyalty. They might support each other in ways different from the original story. For example, Sasuke could be more open about his feelings because he has Naruto as a true brother. Another plot could be them facing challenges together that are specifically related to their adopted family status, like dealing with the expectations of their new family or protecting their new family from threats.
Another plot could be that they discover their pregnancies around the same time and decide to support each other in their respective journeys. They might share their fears and hopes, like Hinata being worried about how her child will fit into the Hyuga clan's strict hierarchy and Neji being concerned about providing a good future for his child. They could then work together to change some of the old ways in the clan for the betterment of their future children.
One interesting plot could be that Neji and Sakura are paired up for a school project. They start off not getting along because of their different personalities. Neji is more reserved and serious, while Sakura is bubbly and determined. But as they work together, they begin to understand each other better and form a friendship that could potentially turn into something more.