One possible plot could be that the singer has some sort of dark secret or power that endangers the village in the Naruto world. Naruto, as the protector, has no choice but to banish the singer to keep everyone safe. For example, the singer might be unknowingly controlled by an enemy and is spreading harmful chakra through their music.
Maybe the singer is from another land and their music disrupts the natural balance of chakra in the Naruto village. Naruto, after trying to find a solution, decides to banish the singer. It could also be that the singer has committed a crime against the village, like stealing a valuable ninja scroll, and Naruto banishes them as a form of punishment.
The singer could be a false prophet of sorts. They sing songs that mislead the villagers, causing unrest and division. Naruto, seeing the harm this is causing, banishes the singer. This could lead to a story where the singer tries to get revenge on Naruto and the village, while Naruto has to defend his decision and protect his people.
Well, one possibility could be that Naruto is somehow transported to the Rosario Vampire world. He might see the vampires as a threat to the innocent humans there and decide to banish them. Maybe he uses his shadow clone jutsu to create a diversion while he sets up a powerful sealing jutsu to send the vampires to another dimension.
One possible plot could be that in a strange crossover world, Naruto sees Pokemon as a threat to his village's way of life. So, he decides to banish them. Maybe the Pokemon's powers are causing chaos in the ninja world, like Pikachu's electricity short - circuiting ninja tools. Naruto, being the hero, takes it upon himself to send the Pokemon back to their own dimension.
One possible plot could be that Naruto, for some reason misinterprets the actions of the Hanyou and the female Kyuubi. Maybe there's a power struggle in the Hidden Leaf Village and he believes they are a threat to the village's stability. So, he banishes them. As they are banished, they could form an alliance to prove their innocence and fight against whatever force is really behind the problems in the village.
One possible reason could be that Hiashi might see Naruto as a threat to the Hyuga clan's secrets or traditions. Naruto is often associated with unpredictable and powerful abilities, and Hiashi, being protective of his clan, may want to keep him at a distance to safeguard the clan's interests.
One possible plotline could be that Naruto discovers some sort of corruption within the ANBU. Maybe they are being used for evil purposes by a hidden group. So, in his quest for justice, he decides to banish them to protect the village. Another could be that the ANBU has become too extreme in their methods, and Naruto, as Hokage, believes in a more peaceful and inclusive approach, thus banishing them.
It could be an original character created specifically for the fanfiction. Maybe a young, talented singer who was once beloved but then falls from grace when Naruto discovers their true nature.
A common plotline could be Naruto returning to Konoha as a powerful and changed individual. He might be hesitant to help the village at first due to his banishment, but eventually, his kind heart prevails. Konoha, in turn, has to grovel and make amends for their past mistake.
It could also be a misunderstanding. Maybe a magical accident occurs and Abuela wrongly blames Mirabel for it. Since the family's magic is so important to Abuela and the community, she might overreact and banish Mirabel without fully understanding what really happened.
In many fanfictions exploring this concept, it often delves into the moral and emotional consequences for Konoha. For example, they might realize the potential they lost in Naruto. His growth outside of the village could lead to him becoming a powerful and unpredictable force, making Konoha regret their hasty decision.
One possible plotline could be that Naruto discovers a group of S - rank ninjas who are secretly plotting against the Hidden Leaf Village. He decides to banish them to protect the village. Another plotline might involve Naruto being forced to banish an S - rank ninja who has committed a heinous crime but has some sort of connection to him. Maybe it's an old friend turned bad. And a third plotline could be that Naruto banishes S - rank ninjas from other villages who have invaded the Hidden Leaf and are too powerful to be kept as prisoners.