Well, one interesting concept could be the origin of the Zero Tails. Maybe it's a new form of chakra manifestation that was previously unknown in the Naruto universe. It could also involve unique abilities that the Zero Tails has, like the power to manipulate a different type of energy compared to the regular tailed beasts.
One interesting aspect could be the unique power or abilities that the zero tails might possess. In Naruto fanfiction, it often gives the author a chance to create something entirely new and different from the canonical tails. It might also introduce new storylines and character developments related to how Naruto and his friends deal with this new, non - canonical threat.
In many fanfictions about the Ten Tails in Naruto, the origin of the Ten Tails might be re - imagined. It could be connected to an ancient civilization that was long forgotten in the Naruto universe. This would open up a whole new world of possibilities for the story, like uncovering ancient secrets and powers that were lost, and how they might impact the current state of the Naruto world.
Well, in Naruto Eleven Tails fanfiction, a cool concept is the relationship between the host of the Eleven Tails and the other characters. The host might be an outcast due to the immense power they possess, and how they deal with that isolation while also trying to control the beast's power is really interesting. Also, the Eleven Tails could potentially have a connection to the Sage of Six Paths that hasn't been explored in the original series.
Perhaps in the fanfiction, the Zero Tails is a manifestation of the negative emotions of the ninja world as a whole. A group of young ninjas discover this and they try to find a way to purify the Zero Tails. They seek the help of old sages and learn ancient jutsu to attempt this purification, which could lead to a battle against those who want to keep the Zero Tails as a weapon of mass destruction.
Well, a cool concept in Naruto Re Zero fanfiction might be the idea of Sasuke in the Re Zero world. He could be seen as a very powerful and mysterious figure, with his Sharingan being a great asset in the world full of magic and danger. Also, the idea of Naruto befriending Subaru and learning from each other's experiences of facing difficulties over and over again can be really interesting.
Well, in a fanfiction where Naruto becomes the zero tails, it could open up a whole new world of storytelling. The zero tails has a mysterious origin and nature. Naruto's transformation into it could mean a shift in the power balance in the Naruto universe. His relationships with other characters like Sasuke and Sakura would also be affected. For example, they might be initially afraid or suspicious of his new form. And Naruto himself would need to learn how to use the zero - tails' power for good, perhaps by finding a way to combine it with his existing values and ninja skills.
One possible plotline could be Naruto's struggle to control his new tails. He might face challenges in his daily life, like accidentally using too much power during training. Another could be how his friends react to his new form. Some might be scared at first, while others try to help him adapt.
Well, a possible plot for a 'naruto with tails fanfic' might involve Naruto using his tails to travel to different dimensions. In these dimensions, he could encounter alternate versions of his friends and enemies. He might have to use the unique abilities of his tails to find his way back home. Or perhaps his tails start to develop a mind of their own and he has to work with them rather than against them to become stronger. Maybe he discovers that his tails hold the key to unlocking a long - lost prophecy related to the Hidden Leaf Village.
One interesting concept could be alternative timelines. Writers might explore what would happen if certain events in the original 'zero no tsukaima' series occurred differently. For example, if Louise had chosen a different familiar. Another concept could be character development beyond what was shown in the anime or manga. Maybe Saito becoming even more powerful in magic in ways not originally depicted. And also, exploring different relationships between the characters, like a deeper friendship between Louise and her classmates that was only hinted at in the original story.
Sasuke could also be a main character. His pursuit of power and his unique abilities could lead him to cross paths with the Zero Tails. Maybe he wants to use its power for his own goals, like avenging his clan or changing the ninja world in his vision.