There are some fanfics on this theme. However, the idea of Kushina abandoning Naruto goes against the original Naruto story's emotional core. In the canon, Kushina sacrificed herself for Naruto. But in fanfics, some might explore this alternate scenario to show Naruto's growth in a different, more tragic context.
Well, in a typical scenario for this kind of fanfic, Kushina might have left Naruto due to some difficult situation or misinformation. When she discovers Naruto has become 'godlike', perhaps with extraordinary powers and a great reputation. Her regret could lead to her attempting to reconnect with Naruto. She may face obstacles like Naruto's initial resentment or the complex political and social situations in the Naruto world that prevent a smooth reunion.
One consequence could be that Naruto becomes an outcast in a different way. In the original, he was an outcast because of the Nine - Tails, but here, it could be because of his abandonment. He might not have the same dreams of becoming Hokage. Instead, he could be more focused on survival.
The main characters would be Kushina and Naruto. Kushina, as the one who regrets her past action of abandoning Naruto. Naruto, who has become 'godlike' in the fanfic, is the center of Kushina's regret. There might also be other supporting characters from the Naruto universe like Jiraiya or Kakashi who could be involved in the story, perhaps as mentors to Naruto or as those who witness Kushina's attempts to make amends.
Maybe it's because she sees Naruto's strength and how he has overcome so many difficulties despite her absence. She realizes that if she had been there, she could have made his journey easier. Also, she might regret not being able to watch Naruto grow up, miss his first steps, first words, and all those precious moments that a mother should be a part of.
Her regret can be a catalyst for character development, not just for herself but also for Naruto. Naruto might struggle with forgiving her at first, which can be a major part of his growth. And Kushina, in her attempt to atone for her past, may interact with other characters in the village in new ways. This can lead to new relationships and plot twists, such as her influencing the village elders' opinions about Naruto or even changing some of the village's traditions related to the treatment of orphans.
There are indeed some great 'Naruto Kushina' fanfics. Some focus on their relationship in the past, like how they first met or Kushina's time in the village before Naruto was born. Others might explore what could have happened if things were different in the Naruto universe regarding their family. You can also check out fanfic communities on Reddit, where people often share and discuss their favorite 'Naruto Kushina' fanfics.
Maybe she was forced to for some dark reason. Perhaps there was a threat to Naruto's life if she stayed, and she thought leaving was the only way to protect him.
Kushina would most likely experience deep remorse. Remorse for not being there for Naruto when he needed a mother. There could also be a sense of longing in her, longing to be part of Naruto's life and to make up for all the lost time. And of course, she might be filled with self - loathing for her past actions.
There's 'Kushina's Memories'. This fanfic delves into Kushina's past, her life in Uzushiogakure, and how those experiences led to her being the person she was when she became Naruto's mother. It gives a lot of depth to her character and her bond with Naruto through flashbacks and her internal thoughts.
One great 'Naruto and Kushina fanfic' is 'A Mother's Love'. It beautifully portrays the relationship between Kushina and Naruto. It shows how Kushina's spirit might have influenced Naruto even more in his journey. Another is 'Kushina's Legacy' which delves into how Naruto discovers more about his mother's past and how it shapes his understanding of his own powers and purpose.