It would be different. Naruto would be more protective of Sakura. Their family bond could lead to some interesting storylines, like when Sakura gets into trouble, Naruto is there to save her not just as a friend but as a brother.
Well, it could be a story full of family - centered emotions. There might be flashbacks showing their childhood together. Naruto might teach Sakura some of his unique ninja skills in a more brotherly way. And their relationship with other characters would also shift. For instance, with Kakashi, Naruto as Sakura's brother could make for some different team dynamics during training sessions. It could also show how they support each other through tough times in the ninja world, relying on that strong family connection.
Well, it would be a radical departure from the original Naruto plot. It might start with some kind of time - travel or alternate - reality scenario that led to Sakura being Naruto's mother. Maybe Sakura would pass on her medical skills to Naruto at an early age, and Naruto could be more focused on healing as well as fighting.
A 'Naruto brother of Zeus' fanfic could be really wild. Naruto has his ninja powers and strong will from the Naruto universe. Zeus, on the other hand, is a powerful god in Greek mythology. If Naruto was his brother, maybe Naruto would inherit some godly powers in addition to his ninja skills. There could be epic battles against other gods or powerful enemies, with Naruto using his unique combination of abilities.
It would probably be full of interesting interactions. Naruto's energetic and determined nature would contrast with Erza's more serious and disciplined personality. There could be scenes where Naruto protects Erza or teaches her some of his ninja skills.
Yes, there are some fanfics out there with this concept. It's an interesting take on the Naruto universe as it completely changes the dynamics between the two characters. They would have a very different relationship compared to the original series, with Naruto being more of a protective family figure to Sakura.
The twin brother's character might be developed based on his past. If he had a difficult childhood, it could make him more reserved or cautious. But as he gets to know Naruto and Sakura, he starts to open up. He could start as a loner type, but as he gets involved in their adventures, he becomes more social and confident. He might also develop his character by exploring his own unique abilities and how they can be used for good.
Well, it could be a story full of complex emotions. Sakura might realize her deep, unspoken feelings for Naruto in the context of desiring a family with him. Maybe she starts to see Naruto in a new light, not just as a friend or teammate. It could involve her overcoming her previous feelings for Sasuke and finally seeing Naruto as the one she truly wants to build a future with, including having a baby.
It would be quite interesting. There would likely be a lot of culture shock as Naruto comes from a world of ninjas and Rukia from a world of Shinigami. They would probably have to learn about each other's worlds. Naruto might be shocked by the existence of Hollows and Soul Reapers, while Rukia would be intrigued by Naruto's chakra and jutsu. Their relationship could start off rocky as they try to understand their new - found family connection.
It could be really interesting. Maybe it would start with Naruto and Sakura going to Suna for some diplomatic mission. During their stay, they start to see each other in a new light and fall in love. The wedding would be a blend of Konoha and Suna traditions. Their friends from both villages would come to celebrate, like Gaara from Suna and Kakashi from Konoha.
One implication could be a different power dynamic. Instead of Naruto inheriting Minato's legacy as his son, they would be more like peers sharing similar powers. Maybe Naruto wouldn't have the same kind of lonely childhood as in the original story.
In fanfiction, their baby might inherit Naruto's blond hair and Sakura's green eyes. It could also inherit Naruto's chakra reserves and Sakura's intelligence. Maybe it would be a natural at ninjutsu like Naruto and have a great aptitude for medical ninjutsu like Sakura.