If Naruto were Samui's brother in fanfiction, it would likely lead to some interesting character interactions. For instance, Naruto might have a closer bond with the Cloud ninjas. He could also get involved in resolving internal issues within the Cloud Village. Maybe he would be more welcomed in the Cloud Village than in the original story. Additionally, it could affect his relationship with Sasuke, as he might have a new support system in the form of Samui and her comrades.
In a fanfiction where Naruto is Samui's brother, there could be a whole new set of adventures. Naruto might be more involved in the affairs of the Cloud Village from an early age. This could lead to him learning different jutsus unique to the Cloud. It could also change his view on the world, as he would be exposed to the culture and values of the Cloud Village. There could be a plot where Naruto has to protect Samui from a common enemy, which would strengthen their bond as siblings. And it might also create a situation where the Hidden Leaf and the Cloud Village have to work together more closely to protect their shared family member.
One possible plot development could be that they initially fight against each other as enemies, not knowing their relation. Then, through some kind of accident or revelation, they find out they are brothers. This could lead to a lot of internal conflict for both of them, especially for Deidara who has been on the 'wrong side' in the eyes of Konoha. Another development could be that there is a third party who knows about their relation and tries to use it for their own gain, forcing Naruto and Deidara to work together to overcome this threat.
In this fanfiction, a likely plot development could be that Naruto starts to experience strange visions or memories from Shisui's brother due to the Sharingan. This causes him to go on a journey to discover the secrets behind these visions. Also, the Leaf Village elders might become suspicious of Naruto's new power and try to keep an eye on him, which creates internal conflicts within the village.
In some fanfictions, authors might create an alternate universe where Naruto is Samui's brother. But in the original Naruto series, there is no such relation.
There could be a shift in the way the wizarding community views Harry. If he's related to Astoria, a pure - blood family, it might change how some pure - bloods interact with him. Also, it could lead to new magical inheritances or family secrets being revealed that involve Harry. For instance, there might be a special family spell or a hidden family vault that Harry now has access to as Astoria's brother. This would add new elements to his character's growth and the overall story.
One possibility is that Naruto's friends launch a rescue mission. They would use their unique skills, like Sasuke's Sharingan or Sakura's medical ninjutsu combined with her combat skills, to find and save Naruto.
In this 'naruto gets poisoned fanfiction', Naruto could also try to fight the poison using his own chakra. He might enter a state of inner struggle where he has to battle the effects of the poison on his body while still trying to protect the village. His Nine - Tails chakra could play a role, either helping him resist the poison or making the situation more complicated if it reacts badly with the poison.
One possible plot development could be that after saving Naruto, Madara tries to mentor him. He sees Naruto's potential and wants to shape him into an even greater ninja, sharing his own knowledge and skills that have been honed over years.
Another plot development could be that Naruto's Enton Release attracts the attention of an ancient and powerful organization. They see Naruto as a key to achieving their own goals, whether it's world domination or unlocking some sort of ancient power. Naruto has to fight against this organization while also trying to understand the full extent of his Enton Release and how it can be used to stop them.
One possible plot development is that Naruto gets to experience a different kind of family dynamic. Kurenai could introduce him to her friends in the village, expanding his social circle. This could help Naruto feel more integrated into the village community.
One possible plot development could be Naruto using his new jutsu to break Yugito free from an enemy's trap. Another could be that Naruto's words break Yugito's negative mindset.