One possible plot development could be that Kushina uses her influence within the village to start a formal request for Naruto to be returned from the ANBU. She might gather support from other characters who also care about Naruto's well - being, like Iruka or Jiraiya. This could lead to a series of political discussions within the village leadership about the role of the ANBU and whether Naruto's skills are better utilized elsewhere.
It could be that Kushina has a premonition about Naruto's future in the ANBU. She might see a vision of him getting seriously injured or turning to a darker path. As a result, she becomes determined to get him back. She starts by trying to communicate with Naruto directly, sending him coded messages or using some sort of mental connection if possible, to convince him to leave the ANBU on his own.
Maybe Kushina discovers some secret danger that Naruto is facing while in the ANBU. So she decides to take matters into her own hands and try to break him out secretly. This would involve her using her ninja skills and knowledge of the village's security system. Along the way, she might encounter other characters who either help or hinder her mission.
One possible plot development could be that Kushina's spirit somehow manages to break through the boundaries between the afterlife and the living world. She then tries to communicate with Naruto, perhaps through dreams at first. This could lead to Naruto starting to search for a way to bring her back permanently, involving him in some sort of ancient and dangerous ritual that he discovers in some long - forgotten scroll.
Some members of the ANBU themselves could be antagonists. They might think that Naruto belongs with them and that Kushina is interfering in their affairs. They could try to keep Naruto in the ANBU by any means necessary, including using force or setting up traps for Kushina when she tries to approach Naruto.
In such a fanfic, perhaps Kushina manages to break free from the afterlife's constraints. She could use some sort of ancient jutsu that allows her to return to the living world. Then, she starts her journey to find Naruto. Maybe she disguises herself as an ordinary traveler at first to observe Naruto from afar, seeing how he has grown and all the hardships he has faced. Once she reveals herself, Naruto is initially shocked but then filled with joy at the thought of having his mother back.
Another aspect could be that Sakura is initially hesitant to take Sasuke back. She could have doubts about whether he has really changed or if he will just leave her again. So, there could be a lot of emotional turmoil between them as Sasuke tries to convince her.
Another aspect could be the emotional impact on Naruto. Having his mother back would be a huge boost to his mental state. He's always longed for family, and Kushina's return would fill that void. It could change his perspective on life and make him even more determined to protect the village and his loved ones.
A simple plot could be that Kushina's spirit appears to Naruto and tells him about her wishes for him. He then sets out on a journey to fulfill those wishes, facing various challenges along the way. For example, he might have to battle an old enemy who is trying to stop him from achieving what Kushina wants.
Well, it could be about Naruto secretly training to become an ANBU member. Maybe he has to hide this from his friends because the ANBU work is so dangerous and secretive.
One possible plot development could be that Naruto grows up with a much closer relationship to his mother. He might inherit her Uzumaki traits more directly. For example, he could have a stronger chakra reserve from the start. Also, Kushina could play a more active role in training Naruto, passing on her unique jutsu and combat skills.
One possible development for Naruto is that he begins to show signs of leadership. Even as a baby, he might gather the other village kids around him and lead them in some small play - adventures. For Kushina, she could develop a more nurturing side. She might start to think more about the well - being of the whole village because she realizes that Naruto will grow up in this environment. So, she could be involved in activities that improve the living conditions in the village, all because of her love for Naruto.
Naruto could develop a stronger sense of responsibility. He is marrying Kushina, so he has to take care of her and think about their future. This might lead to him being more cautious in his actions. Kushina, on the other hand, may develop a more open - minded attitude. She might start to accept new ideas and ways of life that Naruto brings to her.