Well, the concept of a weak devil in a world like DxD already sets up a sort of underdog story. When combined with Naruto, who is also familiar with being an underdog in his own world, it can lead to some really inspiring stories. The fanfic can also introduce new plotlines like how the weak devil and Naruto deal with the politics of the DxD world, or how they use their combined skills to face threats that neither could handle alone. There are countless possibilities for adventure, growth, and discovery in this kind of fanfic.
The character development can be really engaging. The weak devil, starting from a position of weakness, can grow and change throughout the fanfic. Maybe they start as a bullied character but end up being a strong ally. And Naruto's presence can be a catalyst for this change. Also, the exploration of the DxD world from Naruto's perspective, as he tries to understand the devils and their society, adds depth to the story.
The contrast. When a fanfic features a weak character in the Naruto DxD universe, it creates an interesting dynamic. For example, seeing a character with less power try to survive in a world full of powerful ninjas and devils makes for an exciting read as they have to rely on their wits more than their strength.
There might be a fanfic where Naruto is reincarnated as a weak devil in the DxD world. In such a story, he has to use his ninja skills and knowledge to survive in a world full of powerful devils and other supernatural beings. The story could explore how his chakra system works in a world dominated by magic, and how he overcomes the prejudice against his weak - devil status.
The cultural clash is really interesting too. Naruto comes from a world with a very different culture compared to the DxD world. Adding Devil Fruits into the mix makes it even more complex. For instance, Naruto's values of loyalty and hard work might interact in unexpected ways with the more morally ambiguous elements of the DxD world and the power - hungry nature often associated with Devil Fruit users.
The concept of a character being underestimated (the 'weak' part) and then turning out to be extremely powerful (the 'king' part) is what makes it interesting. It's like a Cinderella story in the Naruto universe. We love to see the underdog rise, and in Naruto, there are so many characters with potential that could be explored in this way.
Character development is a big part. In these fanfics, Naruto has to start from a weak point and grow. He might learn new skills or adapt his old ones. He could learn about the magic in Fairy Tail and combine it with his ninja abilities. This journey of self - improvement and discovery is really engaging. Also, the interactions with Fairy Tail characters add depth. When Naruto meets characters like Lucy or Gray, their different personalities and abilities create unique storylines.
The clash of different power systems. Naruto's ninja abilities, especially with his immortality, against the unique powers in DxD like the Sacred Gears. It creates exciting battles and strategic scenarios.
The Naruto 12 Wings DxD Fanfic is cool mainly due to the character development. In this crossover, Naruto might gain new traits influenced by the DxD universe. His usual ninja way could be challenged or enhanced by the presence of the DxD's complex power structure. The 12 wings aspect gives him an almost god - like status, which changes his relationships with other characters. He might form new alliances or rivalries with the devils, angels, or fallen angels. This creates a rich tapestry of stories that deviate from the normal Naruto or DxD plotlines.
The combination of two very different universes. Naruto's ninja world with its jutsus and shinobi culture, and DxD's world of devils, angels and supernatural beings. It creates a whole new set of possibilities for stories.
The combination of different universes. Highschool DxD has its own unique world of devils, angels, and other supernatural beings. Naruto has ninjas and a complex world of chakra. When you mix Rossweisse from Highschool DxD with the Naruto universe, it creates a lot of interesting possibilities for crossovers. Maybe Rossweisse could learn ninjutsu, or the Naruto characters could interact with the devils and angels from Highschool DxD.
The uniqueness lies in the combination of two very different universes. Naruto's world is full of ninjas and chakra, while DxD has devils and a whole different power system. His tsundere personality adds a new dynamic as it contrasts with the often - flamboyant and sly nature of devils in DxD.