In some cases, the antagonist could be the misunderstandings and grudges within the village. These negative elements might have pushed Naruto to become evil. So, in a way, the village's own flaws can be seen as the antagonist. Kushina then has to deal with the consequences of these flaws while trying to save her son from his evil path.
The main antagonist could be the evil Naruto himself. Since he has turned to the dark side, his actions and motives would be against the well - being of the village and those around him, including Kushina. He might be the source of conflict and chaos.
It could also be an outside force that has corrupted Naruto and made him evil. This outside entity could be the real antagonist. Maybe it's a powerful dark wizard or a secret organization that wants to use Naruto's power for their own evil ends. And Kushina has to fight against both this outside force and her own son.
Maybe an ancient evil that has been awakened. This entity is so powerful that it takes the combined godlike powers of Naruto and Kushina to stand against it. The antagonist could have some connection to the origin of chakra or an old, forgotten curse.
The Hidden Leaf Village itself could become the main antagonist. Since Naruto turns evil, the village that once nurtured him would now be against him. The village elders and some of the ninja who oppose Naruto's new evil ways would be in conflict with him. For example, Kakashi might be forced to fight against Naruto to protect the village.
There could also be new characters introduced as antagonists. In this fanfiction, perhaps there are dark entities that are either drawn to Naruto's new evil self or are competing with him for control. They might have powers that rival or complement his Rinnegan - based abilities, leading to some intense battles and power struggles.
Sasuke could also become an antagonist in this scenario. If Naruto turns evil, Sasuke, who has his own sense of justice, would likely oppose Naruto. Their once - strong friendship would be shattered, and they would end up fighting each other, with Sasuke trying to stop Naruto from causing more destruction.
The Akatsuki as a whole could be antagonists. In fanfictions, the Akatsuki might be interested in the power of Naruto's Evil Rinnegan. They could try to capture him to extract the power or use him in some way for their own goals. Pain, being a powerful member of the Akatsuki, could also be a specific antagonist. His own ideology about pain and peace might clash with Naruto's new, potentially more chaotic state with the Evil Rinnegan. Additionally, new original antagonists created specifically for the fanfiction could be common. These could be dark, powerful figures who are drawn to the power of the Evil Rinnegan and want to either possess it or destroy Naruto to prevent its misuse.
Often, it portrays a very strained relationship. Naruto is likely to be confused and hurt by his mother's evil actions. He may try to reason with her at first, believing that there is still good in her.
Jiraiya could also be one of the main characters. He was Naruto's mentor and had a connection with Kushina's family. He could play a role in helping them adjust to the time travel and also use their knowledge to his advantage in some ways, like getting intel on future threats.
One possible fanfiction could be where 'evil Minato and Kushina' are under some sort of dark magic or mind control. They find Naruto not as their beloved son but as a target. Maybe they are being manipulated by a powerful enemy of the village who wants to use Naruto's power for evil. However, Naruto's pure heart and the bonds he has formed with his friends start to break through the false personas of his parents.
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.
Often, it could be a group of rival students from another college who are jealous of Naruto and Sakura's skills or achievements. They might try to sabotage their projects or disrupt their college events.