In a fanfic where Naruto isn't Kushina's son, he could be a foundling left at the doorstep of the Hokage's office. He might be from a far - off land where his parents were exiled. His journey would then be about finding out his true heritage rather than the connection to Kushina and Minato. This would also impact his relationships with characters like Sasuke and Sakura, as his identity crisis would be of a different nature.
Well, it might also focus on the Uzumaki clan heritage. Given that Kushina was an Uzumaki, the fanfic could delve into Naruto's connection to the clan's powers and secrets that he might not have fully explored in the original series. This could include unique jutsu or abilities that come from his Uzumaki bloodline.
The story would change a great deal. For one, Naruto wouldn't have the same connection to the Nine - Tails as he does in the original. Minato sealed the Nine - Tails into Naruto, so without that relation, the whole dynamic of the Nine - Tails within Naruto would be different. He might not have the same power - up moments related to the Nine - Tails.
Well, in such a fanfic, Naruto could be the son of someone like Jiraiya. Jiraiya was very close to Naruto and taught him a great deal. He might have had a secret relationship that led to Naruto's birth. Another possibility could be that Naruto is the son of an unknown shinobi from a far - off village who somehow ended up in Konoha.
The fanfic might give more focus on the Uzumaki side of Naruto's heritage. In the original, while his Uzumaki blood was important, it wasn't always the central focus. Here, it could be that Naruto starts to learn Uzumaki techniques earlier or has a stronger connection to Uzumaki - related storylines. For example, he might be more involved with the secrets of the Uzumaki clan's sealing jutsu right from the start. Also, his relationship with characters who knew Kushina, like Minato's friends, could be very different as they might see him as a reminder of Kushina and treat him accordingly.
One possible fanfic could be about Kushina's early days in the Hidden Leaf. It might explore her training as a ninja, her relationships with her peers, and how she was perceived in the village. Maybe it delves into her friendship with Mikoto and how they supported each other during their pregnancies.
The 'naruto son of evil kushina fanfiction' could potentially be about a lot of things. It may start with a different backstory for Kushina, like she was influenced by some dark force which made her 'evil'. Naruto, being her son, might then be ostracized or have a difficult path in the ninja world. It could also delve into how Naruto discovers the truth about his mother and whether he tries to change her or just accepts the situation and forges his own path. There could be new characters introduced who either help or hinder Naruto in this new scenario.
In some fanfictions, Kushina's son complex can create interesting plotlines. It can be a source of conflict, say when Naruto wants more independence but Kushina is reluctant to let go. It also showcases her strong maternal instincts. This complex can be used to develop Naruto's character as well, as he responds to his mother's intense love and protectiveness, perhaps growing in patience and understanding.
Obviously, Naruto is a central character. Kushina herself often appears, either in flashbacks or in some magical - like resurrected form. Minato, Naruto's father, is also common as he is closely related to Kushina. Then there are Naruto's friends like Sasuke and Sakura. They might play different roles, for example, Sasuke could be more involved in helping Naruto understand his mother's side of the family.
Naruto might be more of an enigma. Without the known family background, he could be more mysterious to the other characters. His character could be darker, as he might not have the same loving family memories. He would have to struggle more to find his place in the world, and this could lead to a more brooding and complex Naruto.