In 'Naruto meets his mother' fanfictions, a prevalent theme is the filling of a void. Naruto has always felt the absence of his parents, and this meeting fills that emotional gap. Additionally, there might be a theme of growth. His mother's presence could inspire Naruto to grow even more as a ninja and as a person. And sometimes, the theme of redemption can be there, especially if there are elements in the story related to Naruto's past struggles and how his mother's appearance helps him move forward from them.
In such a fanfiction, Naruto might have an emotional moment. He could finally learn more about his family's past directly from his mother. Maybe she would share some secret jutsu or wisdom with him.
Well, one possible plot could be that Naruto accidentally travels back in time and meets his mother. His mother, Kushina, might initially be shocked but then quickly recognize him as her son. She could then start to teach Naruto some of the Uzumaki clan's secret techniques that she never got the chance to pass on in the original story.
Another character could be the Nine - Tailed Fox. Kushina was once the jinchuriki of the Nine - Tailed Fox. When Naruto meets his mother, the topic of the Nine - Tailed Fox might come up. Maybe Kushina could tell Naruto some secrets about controlling the Nine - Tailed Fox's power that she learned during her time as its jinchuriki.
Goku's reaction could be a mix of shock and happiness. On one hand, he never expected to actually meet his parents. On the other hand, he has always longed for a family connection. He might start asking them a million questions right away about their lives, Saiyan culture, and what it was like when he was born.
One possible scenario could be that Blu is initially nervous when he meets his mother. He might be hesitant, but as they start to interact, he realizes how much he has in common with her. For example, they could both have a unique way of communicating with other birds. Their reunion could be filled with a mix of emotions, from joy to a bit of awkwardness at first.
In fanfiction, Naruto might show his love for his mother through his memories. He could constantly recall the little time he had with her. For example, he might remember any advice or lullabies she gave him. These memories could fuel his actions, like when he faces difficulties, he might think about how his mother would want him to be strong and persevere.
She could be a former pirate captain herself. Maybe she was one of the most feared pirates in her time, and her skills and reputation were passed down to Luffy in some way, even if he didn't know it was from his mother.
His friends from the guild could be important. For example, Happy might be there to share in the joy of Natsu meeting his mother. Happy could also provide some comical relief during the emotional encounter.
Most of the fandom would probably be horrified. Naruto is known for his positive values, and killing a family member is completely against that. There would likely be a lot of criticism towards the author of such a fanfic.