In a fanfiction where Kushina survives, she could play a crucial role in preventing the Uchiha massacre. Given her strong will and connection to the village, she might be able to mediate between the Uchiha clan and the village leadership. This could lead to a very different future for Sasuke and Itachi as well, with the Uchiha clan remaining a part of Konoha and not turning against it.
A storyline could be that the seal holding Kushina inside Naruto starts to weaken for some reason. As a result, Naruto has to deal with the emerging consciousness of Kushina while also trying to keep it a secret from his friends. This internal struggle could lead to some interesting character development and new plot twists.
A possible storyline might involve Naruto and Kushina having to navigate the challenges of raising a family while also being important figures in the ninja world. They would need to balance their duties as parents with their responsibilities to their villages. There could also be a story where they face a crisis within their relationship, like a misunderstanding or an outside influence trying to break them apart, and they have to work through it to keep their family intact. Additionally, they could be involved in diplomatic missions together as a married couple, representing the Uzumaki and their respective villages.
One possible plot could be that Kushina's survival changes Naruto's upbringing completely. Instead of being an orphan, he grows up with a loving mother. She could teach him advanced Uzumaki clan techniques early on, making him even more powerful in the ninja world.
Maybe a story where they both find themselves in a dangerous situation outside of their respective villages. They have to rely on each other's skills and powers to survive, and in the process, a deep friendship or more could develop. For example, they could be trapped in a mysterious and dangerous forest filled with powerful beasts.
Well, perhaps in the 'naruto abused by kushina fanfic', it could start with Kushina having a premonition of Naruto causing great harm in the future. So, in her attempt to prevent that, she goes overboard and starts abusing him. Or it could be due to some long - hidden family secret that makes her act out against Naruto, thinking she's doing the right thing for the family or the village in the long run.
A 'neglect' fanfiction could show that Kushina is trying to protect Naruto in a wrong way that results in neglect. She might think that by distancing herself from Naruto, she can keep him safe from her enemies. However, Naruto doesn't understand this and just sees his mother as being cold and uncaring. As a result, Naruto might develop a tough exterior and have trust issues as he grows up.
One interesting storyline could be Kushina teaching baby Naruto some basic ninja skills in a really gentle and loving way. For example, she might show him how to throw a kunai softly so he doesn't hurt himself. Another could be their interactions with the other villagers. Maybe Kushina takes Naruto around the village to introduce him to the different shops and people, which would be really cute as baby Naruto would be all wide - eyed and curious.
Another could be a story where baby Naruto has a special connection with Kushina's chakra, and this connection helps him in some unexpected situations. Maybe when he is in a dangerous situation, the memory of Kushina's chakra within him gives him an extra boost to escape or fight back. Well, it could also be a story about Kushina protecting baby Naruto from some unknown threats within the village. There could be some secret enemies who are after Naruto for some reason, and Kushina uses all her skills and wits to keep him safe.
Perhaps Kushina is a powerful ninja from another village who comes to Konoha on a diplomatic mission. Naruto, being curious and always looking for new challenges, gets involved with her. They end up on a journey together to solve a mystery that threatens both of their villages. Or, Kushina could be a trainer in a secret ninja academy where Naruto is sent for special training and they form a bond over his training progress.
One possible reason could be for Naruto's protection. Maybe she thought by banishing him from a certain place or situation, she could keep him away from a hidden danger that she knew about. For example, there might be a powerful enemy targeting Naruto specifically, and she believed that by making him leave, he would be harder to find.