Well, it could be about Naruto ruling the underworld with his unique ninja skills. Maybe he uses shadow clones to manage different aspects of the underworld, like keeping the peace among different criminal gangs or uncovering dark secrets.
It could be amazing. Naruto might have the power to judge souls. He could use his typical Naruto values like friendship and determination in a new context, deciding which souls are worthy of salvation or punishment. His appearance might also change to reflect his new status, perhaps with some Shinigami - like robes and a more solemn demeanor.
It could be really interesting. Maybe Naruto, with his ninja skills, would be a powerful king in the World of Warcraft universe. He might use his chakra in ways similar to magic in WoW. For example, his shadow clone jutsu could be like some kind of spell to create minions.
One possibility could be that Harry uses his skills and courage in a whole new way. He might face different types of magical creatures from the underworld. For example, he could encounter demons that have powers he has never seen before. His friends, like Hermione and Ron, might also be involved, but they would have to adapt to this new and dark environment. Maybe Hermione would use her vast knowledge to find ways to navigate the underworld's rules, while Ron would be there for his loyalty and his ability to provide some light - hearted moments in such a dark setting.
A fanfiction with Naruto as the One - Eyed King would be a complete re - imagining of the Naruto universe. His appearance would be altered, and his powers would be on a whole new level. He could have the ability to control some sort of dark or otherworldly force. His friends, like Sasuke, would have to re - evaluate their relationship with him. Naruto might be more solitary as the One - Eyed King, as the power and the role might isolate him. His enemies would be even more terrified of him. The story could explore how Naruto copes with this new identity, how he uses his powers for good or bad, and how the entire ninja world reacts to this new Naruto.
It's possible that some new characters are introduced in this fanfiction. They could be powerful underworld figures that Naruto has to deal with. These characters could have their own motives and backstories, and they would interact with Naruto in various ways, either trying to ally with him or overthrow him as the king of the underworld.
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His rule would probably be fair. Naruto has always been about justice and understanding. He might reform the hell system, making it less cruel and more about rehabilitation for souls.
The plot could start with Naruto discovering his true heritage as the son of King Cold. This would shock the ninja world. He might then have to deal with people's fear and mistrust of him. Meanwhile, he could start to develop some of King Cold's powers, like the ability to survive in extreme cold or have some sort of energy - based attacks similar to those in Dragon Ball. And he would have to decide whether to embrace his new identity or reject it and continue to be just a ninja.
Maybe through a series of unexpected magical events. For instance, he could accidentally stumble upon a powerful ancient magic in the Forbidden Forest that has a connection to the underworld. This magic could bind him to the underworld in a way that gives him the position of king. Or perhaps he is tricked by a dark wizard who wants to get rid of him by sending him to the underworld, but instead, he ends up ruling it due to his natural leadership skills and the respect he gains from the underworld creatures.
In this kind of fanfiction, Naruto could be an ordinary ninja with extraordinary determination. He might develop his skills through sheer hard work and unique training methods not related to the Kyuubi's power. For example, he could focus more on his family's secret jutsu if there was any, or he might be trained by a hermit ninja who has a different approach to combat. This would change his journey entirely as he would not have to face the prejudice that comes with being a Jinchuuriki.