It could be Orochimaru. Since Orochimaru has a long - standing feud with Jiraiya and is always up to no good. If Naruto ditches Jiraiya, Orochimaru might see this as an opportunity to manipulate Naruto. He could try to convince Naruto that Jiraiya was holding him back and that he can offer Naruto more power, all while having his own evil plans for Naruto.
Often, Gai is paired with Kakashi in Hurt Kakashi fanfiction. Gai, with his unwavering belief in friendship and his eternal rivalry with Kakashi, can be a great character to interact with a hurt Kakashi. He might try to pull Kakashi out of his slump through their friendly competition. Also, Rin is sometimes included. Since she has a significant past with Kakashi, her presence in the fanfiction can either be a source of comfort or more pain, depending on how the story is written.
There may be some interesting Kushina and Jiraiya fanfictions. You could search on platforms like Archive of Our Own or FanFiction.net. When looking, pay attention to the tags and summaries to find ones that focus on the elements you're interested in, such as their friendship or potential collaborations in the story.
One great fanfic could be about their adventures before Naruto was born. It might explore their relationship dynamics, how they trained together and supported each other. Maybe in this fanfic, Jiraiya tries to convince Tsunade to take on more dangerous missions with him, showing his trust in her abilities.
It could lead to Naruto becoming even stronger and more skilled than in the original story. Jiraiya's training methods might unlock new powers for him.
I recommend the following two novels to you. They are " Man Has Transmigrated, Clone Doomsday Survival " and " Crazy Clone Evolution System." These two novels were both about animal doppelgangers, and they were both about the protagonist experiencing the ability of doppelgangers in another world or the apocalyptic world. I hope you will like these two wonderful novels. I look forward to your feedback.
Another good place could be some Naruto - focused forums. There are often threads dedicated to sharing and discussing fanfictions. Members of these forums might recommend some great Tsunade and Jiraiya fanfictions that they have read. It's also a great way to interact with other fans who have similar interests.
Adventure - themed fanfictions are also common. Since they are both powerful ninjas, authors like to create stories where Tsunade and Jiraiya go on dangerous missions together. These stories might include battles against powerful enemies and the development of their relationship during the course of the adventure. It could be about how they learn to trust and rely on each other more during these tough situations.