The fanfiction might depict Dark Naruto as being consumed by his hatred for Kushina. He could be shown as having a single - minded focus on causing harm to her memory or any remnant of her influence. His character could be presented as having no room for any positive emotions towards her, and his actions are solely driven by this hatred.
Often, it portrays Dark Naruto as extremely bitter. He may be shown constantly thinking about Kushina in a negative light, with his every action towards her being full of malice. For example, he might plot revenge against her, even though she is dead in the original story.
In this fanfiction, Dark Naruto may be portrayed as having a distorted view of Kushina. He might misinterpret her actions or intentions from Naruto's life. For instance, if Kushina had done something to protect Naruto in the past, Dark Naruto could see it as an act of controlling Naruto rather than protecting him. This misinterpretation then feeds into his hatred for her, and his character is developed around this warped perception.
One possible reason could be that Dark Naruto might see Kushina as a symbol of the world that rejected him. Since she was an important part of Naruto's family and the village, and Dark Naruto represents Naruto's negative emotions, he could resent her for the life he didn't have. He may feel that if Kushina had been there for him more (in his twisted view), he wouldn't have turned into this dark version.
It could develop in a complex way. Maybe at first, Kushina is shocked by Naruto's dark transformation. But as a mother, she tries to understand him. She might start by reaching out to him, trying to find the root of his darkness.
The fanfiction could develop this hatred through the introduction of new characters. These characters might feed Naruto false information about Minato and Kushina, making him question their motives and ultimately hate them. For example, a character who has a grudge against the Uzumaki family could manipulate Naruto.
Dark Naruto could be characterized as more brooding and cynical. Instead of his usual optimistic self, he might be distrustful of others due to some past betrayal. His powers might be more uncontrollable, with the Nine - Tails' influence being more prominent. Dark Kushina could be shown as a fierce and unforgiving figure. She may be highly protective of Naruto and willing to do whatever it takes to keep him safe, even if it means using extreme measures.
Another way is through his attitude towards the villagers. He would show no respect or kindness to them. Instead, he would be cold and hostile, perhaps even going as far as to physically intimidate those who cross his path in Konoha.
Maybe in this fanfiction, there was some sort of dark magic or mind - control involved. Kushina could have been unknowingly influenced to do something that deeply hurt Naruto. Like she was made to abandon Naruto at a crucial moment in his life, which then led to his hatred.
One possible reason could be a misinterpretation of Kushina's actions. Maybe some events were presented in a way that made Naruto think she was neglectful or had made bad decisions in the past.
She could also be developed in relation to the Dark Puppeteer's backstory. Maybe there was a past encounter between them that was never fully resolved. This would add depth to her character as Naruto uncovers more about her past and how it relates to the current threat.
Maybe in this fanfic, there has been a misinformation spread about Naruto that makes Kushina believe he has done something unforgivable. For example, if false rumors say that Naruto is involved in something evil, Kushina might start to hate him without knowing the truth.
It's difficult to determine the popularity of this particular fanfiction. There are so many fanfictions out there in the Naruto fandom. If it has a unique and engaging story, it might be popular among those who are into darker interpretations of the Naruto characters and stories. However, it could also be relatively unknown if it hasn't been promoted well or if the theme is too niche for most fans.