In the fanfiction, the tail might be a sign of Naruto's connection to a new form of chakra. This chakra could be more primal and powerful. Naruto would struggle to harness it without losing his sense of self. As he tries to master this new power, he discovers that there are others out there with similar powers who want to either help him or use him for their own evil purposes.
One possible plot could be that Naruto's new tail gives him unique abilities related to balance and agility, like a real fox. He might have to learn to control it at first, causing some comical situations in the Hidden Leaf Village. Maybe he could use it as an extra limb in battle, grabbing kunai or shuriken that he couldn't reach otherwise.
Perhaps the growth of the tail is related to some ancient curse or prophecy. Naruto could be seen as a threat by some in the village who don't understand what's happening to him. However, his friends like Sasuke and Sakura would stand by him. He would then embark on a journey to find out the origin of this tail and how to control it fully. This could involve visiting old sages or exploring forgotten ruins.
One possible plot could be that Naruto discovers a new jutsu or is under a curse that causes him to grow fox ears and a tail. This new form might make his friends initially confused or even a bit scared. But as the story progresses, he learns to control this new part of himself and uses it to his advantage in battles, like having enhanced senses from the ears and better balance with the tail.
Well, perhaps Percy is a character in a magical world. He could have been cursed or exposed to some strange magic that causes him to grow a tail. Maybe it starts as a small, furry growth that he tries to hide, but as the story progresses, the tail takes on a life of its own and gives him unique abilities like climbing better or sensing danger.
Well, perhaps the plot could involve Izuku suddenly growing ears and a tail due to some sort of experiment gone wrong. He then has to deal with the new appendages while trying to keep it a secret from his friends and teachers at U.A. High. Maybe he discovers new abilities that come with these changes, like enhanced senses.
Well, one possibility is that Naruto gains wings as a result of some new and powerful jutsu he discovers. Maybe it's a forbidden jutsu that has unexpected side effects, like the growth of wings. With these wings, he could gain new abilities in combat, such as faster aerial attacks or the ability to reach distant places quickly.
In the 'naruto grows a garden fanfiction', it could be that Naruto starts the garden as a way to relax. He might plant different types of flowers and vegetables that are native to the Hidden Leaf Village. As he takes care of the garden, he discovers that the plants have a connection to his chakra, and he can use his chakra to make them grow faster.
Maybe it could be due to a misfired spell in Hogwarts. Some student might accidentally cast a spell on Harry, and instead of the intended effect, it makes him grow a tail. It would be a really strange and comical situation for him.
One possible reason could be a strange side - effect of his connection with the Nine - Tails. Since he has the Nine - Tails' chakra within him, in the fanfiction world, this chakra might start to physically manifest in the form of fox ears and a tail during his time in Wave. Maybe the unique environment or a specific event in Wave triggered this abnormal transformation.
One possible plot could be that Naruto is somehow transported to a world where Saiyan powers and Fairy Tail magic exist. He might start off as an outcast, not understanding these new powers at first. But as he trains and learns, he combines his ninja skills with Saiyan strength and Fairy Tail magic to become a powerful force and fight against an evil that threatens all three aspects of this new combined world.
Well, perhaps in this fanfiction, Fairy Tail characters bully Naruto because they are jealous of the attention he gets from certain characters in their shared universe. They start by making fun of his appearance, like his orange jumpsuit, and then escalate to more mean - spirited pranks, like using their magic to disrupt his ninja training.
Well, it could be that in this fanfic, Naruto is somehow transported to the Fairy Tail universe. And due to his different power set and origin, the Fairy Tail members misunderstand him and think he's a threat. Maybe they see his shadow clone jutsu as some sort of dark magic and turn against him.