In the Naruto canon, Naruto would never kill his mom. However, in some extremely dark and non - canonical fanfictions, the author might create such a scenario for shock value. But this goes completely against the spirit of the original series. Naruto is a story about love, friendship and growth, and such a plot is a very perverted deviation from it.
If such a fanfiction exists, a possible motive could be some kind of mind - control. Maybe an enemy uses a powerful genjutsu on Naruto, causing him to lose his sense of self and attack his mom. But this is still a very far - fetched and unethical concept within the Naruto world.
In some fanfictions, Naruto might use a powerful jutsu he discovers or masters. For example, he could find a forbidden jutsu that has the power to bring the dead back to life. Maybe it's a jutsu that requires a great sacrifice on his part, like giving up some of his own chakra permanently.
In some fanfictions, Naruto might find his mom through a special jutsu. For example, he could discover a hidden scroll that reveals a time - traveling jutsu. Using this jutsu, he travels back to the time when his mom was alive and meets her. Another possibility is that some powerful entity guides him to a secret dimension where his mom is trapped.
Jiraiya could be important. He was Naruto's mentor and knew Naruto's father well. He might have some stories about Naruto's parents that could add more depth to the meeting. Maybe he could be there to witness the encounter between Naruto and his mom and share his insights.
One consequence could be a change in the family dynamic. His mom would be back, and Naruto would finally have the family he always dreamed of. This might also have an impact on his relationship with his dad, as they would all be together again.
Naruto could also be a bit angry at first. Angry that she had been away from him all this time. But then that anger would quickly turn into overwhelming love and relief. He would have so many questions to ask her about why she wasn't there as he was growing up, but at the same time, he would be so glad to have her there now.
The main characters are obviously Naruto, his mom Kushina, and his dad Minato. Naruto is the protagonist of the Naruto series, and in this fanfiction, his parents play important roles in his life, whether it's through memories, time - traveling encounters, or spiritual visitations.