Maybe in the fanfiction, Jiraiya is summoned by a new jutsu gone wrong. When he meets Boruto, he mistakes him for Naruto at first. As they interact, Jiraiya realizes Boruto's own unique struggles. He shares his wisdom about handling the expectations that come with being a ninja from a famous family, and Boruto learns a great deal from him.
In this fanfiction, Jiraiya could be a spirit that only Boruto can see. Boruto is initially scared but soon realizes that Jiraiya has a lot to teach. Jiraiya tells Boruto about Naruto's past, things that Naruto has never shared. This knowledge makes Boruto understand his father better and also gives him the motivation to become a better ninja, as he sees the legacy he is a part of.
In this fanfiction, Boruto might learn some unique ninja techniques from Jiraiya. Jiraiya could see the potential in Boruto and train him in his own unorthodox ways. Maybe Boruto would be introduced to Jiraiya's toad summoning, which could add a whole new dimension to his combat abilities.
Perhaps an old enemy of Jiraiya who was thought to be defeated but has now resurfaced. This antagonist targets Boruto to get to Jiraiya, thinking that by harming Boruto, he can draw Jiraiya out and finally get his revenge. He would be a powerful and cunning foe, making it difficult for Jiraiya and Boruto to face him.
Jiraiya could act as a mentor to Boruto. He might correct Boruto's mistakes in combat or give him advice on how to handle difficult situations. Boruto would listen intently, trying to soak up all the knowledge from this legendary ninja. And they could also have some light - hearted moments, like joking about Naruto's clumsy moments when he was young.
One possible interesting plot could be Naruto and Boruto getting transported to a parallel dimension where their roles are reversed. Boruto has to deal with the challenges Naruto faced in the past, like fighting powerful villains without the advanced technology he's used to. Meanwhile, Naruto gets to experience the modern ninja world from Boruto's perspective, including the new ninja tools and different social dynamics in the Hidden Leaf Village.
Perhaps in this fanfiction, Neji is brought back to life somehow. Boruto, being curious, approaches Neji. Neji then discovers how much the ninja world has changed since his time. Boruto could show Neji the new technology in the Hidden Leaf Village. Neji might be a bit shocked at first but then start to see the potential in these new things. They could also form an unlikely friendship, with Neji guiding Boruto in matters of honor and discipline, which are values Neji held dear.
One possibility is that Kurama senses a new threat approaching and decides to team up with Boruto. They could go on an adventure together, with Boruto having to learn how to work with the powerful and sometimes grumpy Kurama. Along the way, Boruto could learn more about the nature of chakra from Kurama, which would be a great development for his ninja skills.
One possible plot could be that Jiraiya, after all his travels, returns to the Hidden Leaf Village and meets Naruto. They could have a series of adventures together, like exploring some long - forgotten parts of the village or training the new generation of shinobi. Jiraiya could share some new jutsu or ninja wisdom with Naruto, which Naruto can then pass on to his students.
In this fanfiction, Jiraiya might also take Naruto on some adventures. They could go on a journey to explore some hidden places in the Naruto world. Along the way, Naruto would learn not only about combat skills but also about different cultures and histories within the world, which would shape his character in new and interesting ways.
One interesting plot could be that Boruto accidentally travels back in time and meets Neji. At first, Neji is on guard, thinking Boruto is an enemy. But when Boruto explains his situation, Neji decides to help him get back to his own time. Along the way, they face some common enemies. Boruto shows Neji some of his unique abilities, and Neji teaches Boruto some of his wisdom and combat skills.
In a 'Boruto meets teen Naruto' fanfiction, Boruto could be amazed by his father's skills as a teen. He might see Naruto's determination in a new light and gain a deeper understanding of his own potential. Maybe they'd train together, with Naruto teaching Boruto some of his old - school jutsu.