Naruto is Rias' brother in a brocon fanfiction. How could this change the Naruto storyline?

Well, considering the devilish nature of Rias' world, Naruto could gain the power of flight, which is not something he has in his original ninja world. He could also gain the power to resist holy attacks, as devils are often weak against holy elements. Another power could be the ability to create and control demonic flames. These new powers would not only change his combat capabilities but also how he is perceived in this new fanfiction world.

A simple idea for the fanfiction could be that the brother, due to his weak body, is always in the shadow of Rias. His 'brocon' nature makes him extremely possessive of her. Naruto, being the outsider, initially doesn't understand this dynamic. But as he gets to know them, he tries to make the brother see that he can have his own identity and purpose, even with his physical limitations. He could encourage the brother to find his own strengths, like intelligence or strategy, rather than just relying on his relationship with Rias.

In this fanfiction, the brother's 'brocon' nature towards Rias could be a complex aspect. He might be overprotective because of his weak body, feeling that he has to be the one to look after his strong sister in some way. Naruto could come into the picture and show him that strength isn't just about physical power. For example, Naruto's willpower and determination are things the brother could learn from. He could start seeing that his sister values strength in different forms too, and this realization could help him grow out of his overly 'brocon' behavior and focus on his own self - improvement.

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.

One possible plotline could be that Rias' brother has a brocon (brother complex) and is overly protective of her. In the Naruto world, perhaps they get involved in a mission together where Naruto also has to work with them. Rias' brother might constantly be trying to keep Naruto at a distance from his sister because he's so possessive. This could lead to some comical misunderstandings as Naruto is just being friendly.

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.

Well, in this fanfic scenario, Naruto's ninja skills could be a huge asset in the High School DxD world. He might introduce new combat styles and strategies. For example, his shadow clone jutsu could be used in various battles or for pranks. Also, his strong sense of justice would likely influence Rias and her peerage. He could help them make more morally upright decisions, and his experience with facing powerful enemies in the Naruto universe would give them new perspectives on handling threats in their own world.

Well, in such a fanfiction, Naruto being a Kryptonian would mean he has heat vision. This new power could be used in battles against the Akatsuki. Instead of using Rasengan, he could simply use his heat vision to take out opponents. Also, his invulnerability would make him a force to be reckoned with. He could walk through most attacks without a scratch. His character might also change as he has to deal with these new powers and the responsibility that comes with them. It's an interesting concept that would mix the Naruto world with the Kryptonian lore.

Well, if Naruto was Ino's twin brother, it would completely change the dynamics in Konoha. For starters, Naruto might not have been as isolated as he was in the original story. Since Ino is from the Yamanaka clan, Naruto could have had early access to some of their clan techniques and knowledge. This could have made him a more formidable ninja from the get - go. Also, his relationship with Sasuke might have been different. Maybe he would have been more focused on his relationship with his sister and the Yamanaka clan rather than being so obsessed with Sasuke's approval.

At first, Rias' brother would see Naruto as a threat to his relationship with his sister. But as time goes on, if Naruto shows that he has no romantic intentions towards Rias and is just a friend, the brother might start to warm up to him. Rias would appreciate Naruto for being able to handle her brother's brocon behavior better than others. And Naruto would just be his usual friendly self, gradually becoming part of their little group.