Obviously Naruto is one of the most important. He has a strong connection to Mount Myoboku. The Great Toad Sage is also crucial as he often imparts wisdom and prophecies. Gamabunta, Naruto's big toad summon, is important too. He has been with Naruto in many battles and is a powerful ally.
One idea could be Naruto discovers a hidden technique in Mount Myoboku that only he can master because of his unique bond with the toads. This technique could give him an edge in a major battle.
Naruto's character would likely be more in touch with nature. He'd have a different view of the world compared to if he was raised in Konoha. He might be calmer and more patient, as the environment on Mount Myoboku is more serene. His sense of humor could also be influenced by the toads' antics.
One interesting plot idea could be Naruto learning unique jutsu from the toads on Mount Myoboku that are different from what he learns in the original series. For example, he might master a special toad - related transformation jutsu that gives him an edge in battles. Another could be Naruto forming a closer bond with the toad elders and learning their ancient wisdom, which he then uses to solve problems in the ninja world. Maybe he also discovers a hidden power on the mountain that is related to the origin of chakra.
Well, in a fanfiction where Naruto is raised in Mt. Myoboku, he would probably be more stealthy and have a different set of values. The toads in Mt. Myoboku have their own culture and teachings. Naruto would grow up learning their ways, so he might not be as brash as he was in the original story. He could be more patient and have a greater respect for all living things, which would also influence his fighting style. Instead of just charging in, he might use more strategic and sneaky moves that he learned from the toads.
Jiraiya might comfort Naruto by sharing his own experiences. He could tell Naruto about the times he faced difficulties and how he overcame them. For example, he might talk about his training with the toads and how he grew stronger through perseverance.
Naruto's relationship with his friends in the Leaf Village would be altered significantly. He would have a more distant relationship with them. Since he was raised in Mt. Myoboku, he would have closer bonds with the toads instead. His idea of friendship might be more in line with how the toads interact with each other, which could make it hard for him to fully connect with his human friends at first.
One possible reason could be that Naruto feels he has learned all he can from Jiraiya at that point. Maybe he wants to explore his own path independently and test his skills without Jiraiya's constant guidance.
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.
They often make him seem irresponsible. For example, in normal Naruto story, Jiraiya is seen as a mentor to Naruto. But in bashing fanfiction, he may be shown as being more interested in his own adventures and leaving Naruto alone at crucial times.