Obviously, Naruto himself is the main character in this situation. His friends like Sasuke and Sakura are very likely to be involved. They would be the ones taking care of him, trying to figure out how to turn him back to normal. Kakashi Sensei would also probably be there, guiding them and trying to keep Naruto safe.
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 having to rely on his friends in a whole new way as a baby fox. Since he can't communicate as he used to, his friends have to figure out his needs through his actions. Another plot might be that Naruto discovers new abilities or powers in his baby fox form that he didn't know he had before.
Well, one possibility is that Naruto would be extremely protective. He has always cared for Hinata in some way, and with her as a baby, he'd likely take on a very nurturing role. Maybe he'd try to find a way to turn her back, or he'd just enjoy taking care of her like she was his own little sister or something. He could introduce her to all his friends in the village as his 'new little friend' and they'd all be super curious about how this happened.
The ninja in the village, like Kakashi, would need to figure out how to handle this situation. They would have to ensure Naruto's safety while also trying to find a way to reverse the transformation. They might also have to deal with any potential threats that come as a result of Naruto's new form. For example, if other villages heard about it, they could try to take advantage of the situation.
In terms of the story's development, it could lead to a whole new arc. Naruto's transformation into a baby girl could be a sign of a greater threat to the ninja world. It might be related to some ancient curse or a new enemy's plot. And as he tries to figure out how to turn back, he would have to rely on his friends and his own inner strength in a different way than before.
One idea could be that in this fanfiction, Wolverine turns into a baby due to a powerful mutant's accidental spell. The X - Men then have to take care of him while also trying to find a way to reverse the transformation. They might discover new aspects of Wolverine's personality as a baby, like his unwavering determination is now shown through his attempts to crawl towards danger.
Obviously Naruto himself is the main character as he is the one who turns into a baby fox. His friends like Sasuke and Sakura would also be involved. Sasuke might be initially confused but then determined to help Naruto. Sakura would probably be more nurturing and try to take care of the baby fox Naruto. Kakashi Sensei could also play an important role, using his wisdom to figure out what happened to Naruto and how to reverse it.
Naruto could also be a great caretaker in his own way. He has a big heart and lots of energy. He'd be constantly playing with baby Kakashi and making him laugh. Although he might not be as organized as Sakura, his enthusiasm would keep baby Kakashi happy and entertained.
One possible plot could be that the transformation is the result of a failed jutsu. Team 7 then has to take care of baby Kakashi. Naruto might be really excited at first, seeing it as a chance to be the responsible one for once. Sakura would be the more practical caretaker, making sure Kakashi is fed and clean. Sasuke would be a bit aloof but secretly curious about this strange situation.