Yes, he can be. Fanfiction is a realm of boundless creativity. If an author wants to reimagine Naruto as an ultimate demon, they can. Maybe they rewrite his backstory to include some dark and demonic elements. For example, his connection to the Nine - Tails could be made more sinister, and his powers could be redefined to be more demonic in nature, like having the ability to spread chaos and destruction.
One thing that might make Naruto an ultimate demon in fanfiction is a corrupted power source. Maybe he gets exposed to some dark chakra that twists his own chakra, including that of the Nine - Tails. His personality could also be warped, making him more aggressive and less empathetic. Additionally, his physical appearance might change to be more demonic, like growing horns or having red eyes, which are all common tropes in making a character seem like an ultimate demon.
If you like fantasy and oriental fantasy novels, I can recommend the Origin of the Great Dao to you. It also belongs to this category. It described the question of who controlled time, space, matter, and energy in the Chaosverse. It was very interesting. I hope you like this fairy's recommendation. Muah ~😗
Yes, there might be. The Naruto fandom is vast and diverse, and fans often come up with creative and unique concepts like Naruto being related to a shark demon. You can try searching on fanfiction websites like FanFiction.net or Archive of Our Own to find such works.
In fanfiction about Naruto and Demon Slayer with magic, one interesting aspect is the potential for new power - ups. For instance, a character could combine the Sharingan from Naruto with a Demon Slayer's special vision ability and create a super - powered form of sight. Also, the magic could be used to explain some of the more mysterious elements in both series. Maybe the curse marks in Naruto are actually a form of suppressed magic, and in the fanfiction, a character figures out how to fully utilize this magic, taking on a new and powerful form inspired by Demon Slayer's demon - slaying forms.
Magic in this type of fanfiction can be used to bridge the gap between the two universes. It can make the transition of characters from one world to another more believable. For example, if Naruto characters enter the Demon Slayer world, magic could be the reason they can adapt to the new rules and powers there.
One possible plot could be that Naruto is suddenly transferred to the Highschool DxD world. He teams up with Issei and they use Naruto's ninja skills and Issei's Sacred Gear powers to face a new threat that endangers both the ninja world and the devil world. Maybe an ancient evil that was sealed long ago has been awakened and they have to find a way to reseal it.
One possible interesting plot could be the characters from Naruto and Highschool DxD universes being forced to attend a special high school together. Naruto characters like Naruto himself might be intrigued by the unique magic and devil - related things in the Highschool DxD world. And the devils from Highschool DxD could learn a lot about chakra and ninja techniques from the Naruto crew. They could have joint battles against a common enemy that threatens both their worlds, and in the process, form unexpected friendships and rivalries.
One possible plot could be that Naruto is somehow transported to the Spider - Man universe. Maybe he lands in New York and is mistaken for a new kind of super - powered being. Spider - Man, being curious, approaches him. Naruto, not understanding this new world, starts using his ninja skills which amaze the people around. They then team up to fight a common enemy like the Green Goblin who has somehow got hold of some chakra - based technology. The combination of Naruto's ninjutsu and Spider - Man's web - slinging and super strength would make for an epic battle.
The Legend of the Demon Cat was a novel about the love story between Emperor Xuanzong of the Tang Dynasty and Yang Yuhuan, based on the friendship between Bai Juyi and Li Bai in the Tang Dynasty. Although the love element occupied a certain proportion in the novel, it was not the theme of the entire novel, nor was it the only theme. In addition, Legend of the Demon Cat also involved history, politics, religion, culture and many other aspects. It was a complicated novel. Therefore, whether or not to think that Legend of the Demon Cat would be the ultimate love legend needed to be considered from many aspects.