In this type of fanfiction, often Naruto's transformation into the nine - tailed fox can lead to some really cool battle scenes. He could use the fox's speed and strength in unique ways. Like, he might be able to run up walls or jump extremely high to attack enemies from unexpected angles. Also, there could be a plot where Naruto has to enter a sort of spiritual realm within himself to communicate with the nine - tailed fox and gain better control over their combined form.
One interesting plot could be Naruto fully transforming into the Nine - Tailed Fox during a battle against a powerful enemy. His friends are initially shocked but then try to find a way to bring him back to his senses.
One possible plot twist could be that Naruto loses control over his transformation into the Nine - Tailed Fox in a completely unexpected situation. Maybe during a friendly spar with his friends, and this causes them to fear him in a new way. It would add a whole new layer of drama to their relationships.
One idea could be exploring the relationship between Naruto and the Nine - Tailed Fox in more depth. Maybe Naruto has to enter the fox's mind - scape and they have a long conversation about their fates being intertwined. Another plot could be a 'what if' scenario where the Nine - Tailed Fox was released earlier in Naruto's life and how he would deal with it without as much training. A third idea is to have the Nine - Tailed Fox take on a human form and accompany Naruto on his adventures, causing all sorts of chaos and also some unexpected moments of friendship.
One idea could be a faunus with the traits of the Nine - Tailed Fox being an outcast in the ninja world because of the power and fear associated with it. They struggle to find their place while also having to control the fox - like instincts within them.
One interesting fanfiction could be about the Nine - Tailed Fox's origin before it was sealed in Naruto. Maybe it was a powerful and free - spirited being in a different realm, and the story could explore its relationships with other mythical creatures there.
In this fanfiction, Naruto could turn into the Nine - Tailed Fox during a time of great emotional turmoil, like when he loses someone close. The transformation is involuntary. As the fox, he runs away into the forest. His friends go on a journey to find him and bring him back to his normal self. Along the way, they discover secrets about the Nine - Tailed Fox's past and how it relates to Naruto.
Another aspect could be that Naruto's baby form has some unique abilities or auras. Maybe his presence as a baby has a calming effect on some of the more aggressive characters in the Naruto world. His friends could also discover new things about his past or his family through his baby state, like finding a hidden mark on his body that gives clues about his heritage.
Well, one interesting plot could be Naruto, as a female, having to deal with different social expectations in the ninja world. For example, she might face more challenges in being taken seriously as a strong fighter since there are some gender biases in the original Naruto world. Another could be her new relationships with other characters. Maybe she forms a different kind of bond with Sasuke, not just as a rival but in a more complex, perhaps more emotionally charged way.
Well, if Naruto turns into the nine - tailed fox in a fanfic, it would be really cool. He would likely be almost uncontrollable at first, as the power of the nine - tailed fox is so immense. But as the story progresses, he could learn to harness that power. His friends might be both in awe and a bit scared of him. And he could use the nine - tailed fox's abilities like its tails for attacks and its natural cunning in combat situations.
One interesting plot could be Naruto's struggle to control the power of the Nine - Tailed Fox when he releases it. He might have to face inner demons and the fear of losing himself to the fox's power.