The plot could start with Naruto having strange dreams or visions related to his hollow and shinigami halves. He begins to notice that he has abilities that no other ninja has. His training then takes a different turn as he tries to understand and master these new powers. Maybe he discovers that his parents had some connection to the spirit worlds, which is why he has this unique nature. He then gets involved in a conflict between the forces of the hollows and the shinigami. With his ninja skills combined with his newfound powers, he has to find a way to broker peace or at least stop a war that could destroy all the worlds he cares about.
Naruto's character development would be quite a journey. At first, he'd be confused and a bit scared of his new powers. He might accidentally lash out with his hollow powers and feel guilty. But as he meets others with similar powers or knowledge of the spirit worlds, he starts to accept himself. His development would also be about learning the limits and capabilities of his powers. He might develop new jutsus that combine his ninja techniques with his shinigami and hollow abilities. His character would also grow in terms of leadership. He could lead a group of beings from different worlds, using his unique perspective to bridge gaps between them, all while still maintaining his core values of friendship and loyalty.
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.
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.
It could be a dark sorcerer who has been studying the secrets of angels and vampires. He discovers Naruto's existence and wants to use him as a key ingredient in a dark spell. The sorcerer is power - hungry and believes that by harnessing Naruto's half - angel half - vampire essence, he can open a portal to a dimension filled with dark magic and bring chaos to the ninja world. He would be constantly devising traps and sending minions after Naruto to capture him.
It could be a powerful ninja from another village who is jealous of Naruto's half - demon half - god powers. He might see Naruto as a threat to his own village's dominance and try to eliminate him.
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.
One plot idea could be that Naruto discovers his half - angel and half - vampire nature during a dangerous mission. His angel side gives him the ability to heal quickly and have a moral compass that is super strong. The vampire side, on the other hand, gives him enhanced strength and speed at night. Maybe he has to hide this from his friends at first because he's afraid they'll reject him. Another idea is that there's an ancient prophecy about a being like him who will save the ninja world from a new, unknown threat that is related to both the angelic and vampiric realms.
Maybe there's an ancient prophecy in the 'naruto half demon half god fanfiction' world that Naruto is the key to saving the world because of his half - demon half - god heritage. But he first has to unlock all of his powers. This would lead to a journey of self - discovery, where he meets different characters who help or hinder his progress. Along the way, he could also learn about the origin of his unique nature and how it came to be.