It would make the story a lot more interesting. Gaara's overprotective nature towards Naruto could lead to some really cool moments. Maybe he'd interfere in Naruto's battles and show off his powerful sand techniques in a new way to protect Naruto. In the plot, this could also create some tension with other characters who might see Gaara's actions as overstepping or interfering too much. It could also lead to some great character development for Gaara himself, as he has to balance his overprotective instincts with Naruto's need to grow and be independent.
Well, it could change the storyline in many ways. For one, Naruto would have an even stronger support system. Gaara, being overprotective, might prevent Naruto from getting into some of the more dangerous situations he usually jumps into. This could potentially slow down Naruto's growth in terms of combat experience as he'd be shielded from some threats. But on the other hand, it could also give Naruto more emotional stability, which could in turn help him better control his chakra and learn new jutsus faster. Gaara's presence as an overprotective brother could also affect how the other characters interact with Naruto. Some might be more cautious around him because they know Gaara is watching over him like a hawk.
Maybe it's because Gaara sees a lot of himself in Naruto. They both had difficult pasts and were kind of loners at first. Gaara wants to protect Naruto from the pain he once endured.
Sakura might be a bit annoyed at first. She's used to Naruto being independent and always charging forward, and Gaara's overprotectiveness could seem like it's getting in the way. Kakashi, on the other hand, would probably be more understanding. He'd see the value in Naruto having someone looking out for him, but he might also try to encourage Gaara to let Naruto grow on his own a bit. Sasuke could have a very negative reaction. He might see it as Gaara trying to steal Naruto away from him in a sense, especially if he has his own unresolved feelings towards Naruto.
In a fanfiction where Naruto is Rias' brother, the Naruto storyline would be altered significantly. Naruto's nature as a person might change due to the influence of the devil society. He may become more sly or strategic in the way devils are. His fighting style could incorporate more magic - like elements from the DxD world. His backstory would now involve being part of a devil family. His relationships with his friends in the Naruto world would be less prominent as he'd be more involved with the devils. For example, instead of going on missions in the ninja world, he'd be involved in devil - related tasks to protect his sister and their family's status.
In this fanfiction scenario, Naruto being Mito's brother would likely impact the political landscape too. The Uzumaki clan has always had an important role, and with this new relationship, Naruto could have more influence in diplomatic matters. Maybe he would have been more involved in the affairs of the Hidden Leaf earlier. Also, his relationship with the other clans, especially those related to the tailed beasts, might be different. For example, his connection with the Uchiha clan could be altered as he has this new Uzumaki - related status.
The story would deviate from the original themes of unity and friendship. Naruto's hatred could split Konoha into factions. This would mean different training regimens, different missions, and different loyalties. For example, Naruto might start his own group of ninjas who share his views, which would completely change the power dynamics in the village.
Well, if Naruto were Tsunade's twin brother, the whole dynamic of the story would be different. Firstly, Naruto might have had access to more advanced medical ninjutsu training from a young age. Tsunade is a master in this field, and she could have passed on her knowledge. Also, Naruto's standing in the village might have been different. He might not have been as much of an outcast since he'd be related to one of the Sannin. His access to resources and the respect he received could have been much higher right from the start.
If Naruto were Itachi's twin in fanfiction, it would have a huge impact on the plot. Naruto would grow up with different values perhaps, influenced by the Uchiha clan's way of thinking. His goal might not be just to become Hokage in the traditional sense. He could be more focused on avenging the Uchiha clan or restoring its honor. The power balance in the village would shift too. The Uchiha clan might have a stronger standing with Naruto being part of it. And the mystery surrounding Itachi's actions would take on a new meaning for Naruto, as he'd be directly related. He might be more involved in uncovering the truth about Itachi's motives much earlier in the story.
If Naruto has the power of Sans Fanfiction, it might introduce some unique interactions. For instance, Sans' power of dodging attacks effortlessly could be combined with Naruto's own combat skills. This could lead to some really interesting fight scenes where Naruto seems almost unhittable. Also, it could affect how he approaches his enemies, as he now has a different set of powers to rely on.
It alters the theme of the original Naruto story. The original story often emphasized forgiveness and the power of friendship. In this fanfiction, if Naruto kills Haku, it might shift towards a darker theme of sacrifice and the harshness of the ninja world. This could also change how the other characters develop. For instance, Sakura might view Naruto differently, either fearing him or seeing him as a more decisive and perhaps colder hero. And Naruto himself might struggle with guilt or a new - found sense of power that comes from taking a life, which would be a huge departure from his usual self in the original storyline.
Well, it completely turns the original Naruto story on its head. In the original, Naruto was the hero who was supposed to overcome all odds with the Kyuubi's power. But in this fanfiction, his death means that all his future achievements are wiped out. It would be a huge shock to the other characters in the story too.