A plot development could be that Kakashi discovers the root cause of Naruto's neglect. It might be related to some hidden secrets in the village. Then Kakashi has to fight against those who are behind Naruto's neglect while still training Naruto. Another development could be that Naruto and Kakashi form a very strong bond. Naruto then uses the skills and confidence he gained from Kakashi to face his enemies and also to try and change the village's attitude towards him.
In this fanfiction, a likely plot development is that Kakashi's help makes Naruto more confident. Naruto then tries to make friends with his peers who previously shunned him. As Naruto becomes more popular, some villains might target him out of jealousy. Kakashi would then have to protect Naruto while also teaching him how to defend himself. There could also be a plot where Naruto's new - found confidence and skills lead him to explore more about his parents and his family's past, with Kakashi's support all the way.
Well, Kakashi might start by spending more time with Naruto. He could train Naruto more intensively, like teaching him new jutsu. Maybe he also shares his own experiences to give Naruto some guidance and motivation.
Another aspect could be the relationship between Naruto and his sister. If she is the favored one, she might initially be oblivious to Naruto's pain. But as the story progresses, she could realize how wrong it is and try to make it up to him. This could lead to a complex family dynamic exploration in the fanfiction.
One possible plot development is that Nagato and Naruto form an alliance to take on a new, greater threat. This threat could be an ancient evil that requires both Nagato's power and Naruto's spirit. Another development could be Nagato using his abilities to help Naruto unlock new powers or forms. For example, he might help Naruto better understand the Sage of Six Paths' power within him.
One possible plot development could be that Naruto's friends in Konoha realize he's missing and start a search mission. They might suspect Kumo immediately due to the history of tensions between the two villages. Meanwhile, in Kumo, Naruto could be held in a secret location. Some in Kumo might want to use him as a bargaining chip against Konoha, while others might see his potential and try to turn him into an asset for Kumo.
It could also be that the sister, in an attempt to help Naruto, gets involved with some dangerous characters or situations. Maybe she tries to find someone powerful to plead Naruto's case, but that person has some ulterior motives. This would add a lot of twists and turns to the story, as Naruto then has to not only deal with his own problems but also save his sister from the trouble she has gotten into while trying to help him.
One possible plot development could be Naruto exploring his new bloodthirsty nature and how it affects his relationships with his friends. Maybe at first they are scared, but then they try to understand him. Another could be Naruto seeking revenge on his family for neglecting him, which might lead to some intense confrontations. And finally, he could find a new family among his comrades who accept him for who he is.
For Naruto, he could become more refined in his skills and strategies under Female Kakashi's influence. He might also learn to be more patient and observant, taking after Kakashi's calm demeanor. For Female Kakashi, she could become more open and warm - hearted, influenced by Naruto's positive energy and his ability to see the good in people.
For Naruto, he could become more self - reliant. Since he's being neglected by Yugao, he might start to focus more on his own growth as a ninja and as a person. He could learn to not rely on others for emotional support as much.
One possible plot development could be that the Sage discovers new powers within himself while being neglected. He might use these powers to prove his worth to the Kiri villagers who overlooked him. For example, he could save the village from a hidden threat, like a powerful and secretive enemy group that the regular shinobi of Kiri were unable to handle.
Naruto, as a baby, could start to develop a sense of trust and security that he didn't have before. With Kakashi around, he could grow up believing in the power of friendship earlier. And as he grows up in this fanfiction, he might be more confident in his abilities because of Kakashi's early training.