The half - brother could be developed as a character with a troubled past. He might have been ostracized in his own community because of his relation to Naruto or his own unique abilities. This could make him initially cold and distant but as he interacts with Naruto, he could gradually open up and become more warm - hearted.
Perhaps Naruto's half - brother was raised in a different village by an enemy of Konoha. He initially hates Naruto but as he gets to know the real Naruto and the values of Konoha, he has a change of heart. They could team up to stop a conspiracy that threatens both their villages. He might also have some special skills in espionage which he uses to their advantage.
In fanfiction, the idea of Naruto being Itachi's half - brother might be based on some creative reinterpretation of the clans. Suppose there was a long - lost connection between the Uzumaki and the Uchiha clans. This could potentially lead to a situation where Naruto and Itachi share a half - brother relationship. However, it's important to note that this goes against the canon story. The beauty of fanfiction is that it allows for these kinds of 'what - if' scenarios.
Sure, there are probably fanfictions with this concept. Fanfic writers are known for their creativity in crossing over different fictional worlds. A 'Naruto is half Saiyan' story could explore how Naruto's life and the Naruto - verse in general would be affected. For example, how would his relationships with his friends and enemies change? How would the ninja world react to his new Saiyan abilities? It could also delve into the backstory of how he came to be half Saiyan, perhaps some kind of inter - dimensional or time - traveling event.
In fanfiction, if Naruto is half - bijuu, it could mean he has enhanced physical abilities. For example, he might have greater strength and speed like a full - bijuu. His chakra reserves could also be much larger, allowing him to perform more powerful jutsu for longer periods.
The fanfiction could also explore how their shared family history affects their fates. There could be an overarching plot where a common enemy or a long - lost family secret threatens both of them. Harry might be initially reluctant to accept Jareth as his half - brother due to Jareth's somewhat menacing reputation. However, as the story progresses, they could learn to work together, combining their unique magical abilities to overcome the challenges in their path.
One implication could be that Naruto has enhanced physical abilities. Angels are often depicted as strong and fast, so Naruto might have superhuman strength and speed. He could also have some sort of divine power, like the ability to heal or purify things. Another aspect could be his appearance. Maybe he has wings or a halo that he can hide or show at will.
Naruto could start as a confused character, struggling with his newfound identity. His usually sunny and determined personality might be overshadowed by fear and doubt at first. As he gets used to his powers, he could become more confident but also more complex, having to balance the good and evil within him.
Another possibility is that he could be the brother of Weiss. Weiss comes from a wealthy and proper family. Naruto's more free - spirited and unorthodox ways would clash with Weiss's upbringing at first, but they could grow to understand and support each other as the story progresses.