Well, it could be that Jiraiya is in a state of extreme exhaustion and is trying to hold off some attackers while waiting for backup. Naruto arrives on the scene and Jiraiya, in his tired and disoriented state, mistakes Naruto for an enemy for a split second. He launches an attack that Naruto is unable to dodge in time. After realizing what he has done, Jiraiya is devastated. The story could then focus on how the village tries to cope with the loss, and how Jiraiya tries to make amends, even though he can't bring Naruto back to life.
One possible plot could be that during a very intense and dangerous training session, Jiraiya attempts a new and powerful jutsu. Naruto, being eager to learn and prove himself, jumps in too soon to assist or observe closely. Jiraiya loses control of the jutsu slightly and it accidentally hits Naruto, leading to his death. This would then cause a huge upheaval in the ninja world. All of Naruto's friends and allies would be in shock and disbelief. Sasuke might be filled with rage and vow to seek revenge, not fully understanding it was an accident at first. And Jiraiya himself would be consumed by guilt, perhaps even going into a self - imposed exile as he couldn't bear to face the consequences of what he had done.
Sakura would be heartbroken. She had grown up with Naruto and always saw his potential. His death would make her question a lot of things. She might become more withdrawn and serious, vowing to become stronger in Naruto's memory. Kakashi would be deeply saddened as well. He had trained Naruto and seen his growth. He would likely feel responsible in some way too, as he was one of Naruto's teachers. As for Hinata, she would be shattered. She had deep feelings for Naruto, and his death would be almost unbearable for her. She might become more determined to protect the village in Naruto's name.
Jiraiya himself would be completely broken. He was Naruto's mentor and had high hopes for him. His actions would likely make him an outcast in the village. Also, the Nine - Tails within Naruto would be a major factor. Its power might go out of control or be lost forever, which could have unforeseen consequences for the balance of power in the Naruto universe.
Well, it might have Naruto learning all sorts of cool jutsu directly from Jiraiya from a very young age. Maybe he'd grow up to be even more powerful and confident earlier in life. He could also inherit Jiraiya's carefree yet determined attitude more deeply.
Well, one possibility is that Naruto would become an even stronger ninja faster. Jiraiya could train him more intensively from a younger age. He'd also be exposed to more of Jiraiya's wild and carefree ways, which might make him more confident and a bit of a prankster like Jiraiya. And Naruto would probably have less of the loneliness he felt in the original story, since Jiraiya would be a more present father figure.
One possibility could be that Jiraiya is under the influence of a powerful enemy's jutsu that makes him lose control of his actions and accidentally attacks Naruto. This could lead to a great deal of guilt and self - loathing for Jiraiya later.
Well, one possible plot could be that Naruto grows up with a stronger sense of toad-based jutsu from the start. He might learn more about the toad world and its secrets earlier, which could make him a more formidable ninja even as a young genin. For example, he could use some basic toad techniques during the Chunin Exams, surprising his opponents.
In such a fanfiction, the plot might involve Naruto turning 'dark' due to feelings of abandonment. He could become bitter and start to question the values Jiraiya taught him. Maybe he'd start using his powers in more ruthless ways, seeing the world as having turned its back on him just as Jiraiya did. He might form alliances with darker characters in the Naruto universe, believing they are the only ones who understand his pain.
Jiraiya's reaction might be complex. He might be in awe of Naruto's new power but also sad about his departure. He could see it as a natural progression in Naruto's journey, yet still feel a pang of loneliness. He might start to reflect on his own life and training methods, wondering if he could have done something differently to keep Naruto with him. At the same time, he would be eager to see what Naruto will achieve in the world with his newfound abilities.
Well, one possible plot could be that Naruto would learn a whole new set of jutsu from Jiraiya much faster. Jiraiya might focus on Naruto's chakra control and teach him some unique rasengan variations early on. Also, Naruto could start traveling with Jiraiya earlier, seeing more of the ninja world and learning about different cultures and fighting styles. This would make him a more well - rounded ninja quicker than in the original story.
Well, it would be a really dark plot. Maybe Sasuke, consumed by his thirst for power or revenge, finally overcomes Naruto in a brutal battle. This could lead to a world in chaos as Naruto was the hope for many. The Hidden Leaf Village would likely be in a state of despair, with all the friends of Naruto vowing revenge on Sasuke.