In fanfiction, Jiraiya's death can also be used to explore themes of sacrifice. He sacrificed himself for the greater good, and this can be further elaborated in different stories. For example, some fanfictions might show how his death inspired other characters to be more selfless.
One possibility in a fanfiction where Jiraiya is alive could be that he returns during the Fourth Great Ninja War. He could use his vast knowledge and powerful jutsu to turn the tide of the war. Maybe he teams up with Naruto again and helps him master new forms of the Rasengan or other powerful techniques.
Naruto is devastated. He feels a huge void in his heart. Jiraiya was the one who believed in him from the start, and his death makes Naruto question a lot of things. He might even start to doubt his own strength for a while.
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One possible fanfic could involve Naruto learning unique jutsu from Jiraiya due to his Rinnegan. Maybe Jiraiya, with his vast knowledge, would train Naruto in ways that are different from the original story. For example, Naruto could master space - time ninjutsu related to the Rinnegan earlier, which would give him an edge in battles against stronger opponents like Akatsuki members. He might also use the Rinnegan to understand the secrets of the tailed beasts more deeply, leading to a different relationship with Kurama.
One scenario could be that Jiraiya is poisoned before his fight with Pain. In the fanfiction, an enemy within the village who is secretly working for Pain's forces might have poisoned his food or drink. So, when he goes to face Pain, he is already weakened, and this ultimately leads to his death. Another possibility is that Jiraiya's death is a result of a time - traveling plot. If there is time - travel involved in the fanfiction, his actions in the past might accidentally create a situation where he has to die to preserve the timeline.
At first, Naruto might isolate himself. He doesn't want to be around others as he is so consumed by his grief. He just sits in his room or goes to a quiet place where he can cry alone and think about Jiraiya.
One reason could be the close bond they had in the original story. Jiraiya was like a father figure to Naruto in some ways. So in fanfic, it's a natural extension to make him Naruto's actual dad. Another reason might be to create new plot twists. For example, it could lead to different power inheritances or story arcs related to Naruto's family history.
One consequence could be a stronger sense of family heritage for Naruto. He might inherit more than just skills from Jiraiya but also a deeper family legacy.