Jiraiya might be included in a 'naruto meets boruto fanfiction' if it involves time - travel or some sort of spiritual connection. Jiraiya was Naruto's mentor and his presence could add a lot of depth to the story. Additionally, Mitsuki, Boruto's teammate, would likely be involved as he often accompanies Boruto on various missions and his unique abilities could come in handy in different scenarios.
Sasuke is very likely to be involved. He has a close relationship with Naruto and is also an important figure in Boruto's life. His skills and knowledge could be crucial in any adventure or situation that Naruto and Boruto find themselves in. Another character could be Hinata. As Naruto's wife, she would surely be concerned about any strange events involving Naruto. And for Boruto, she is his mother, so she would play a role in any family - related or village - threatening situations.
The most popular characters in 'Boruto meets Naruto fanfiction' are Naruto and Boruto, as they are the main focus of the concept. However, characters like Jiraiya can also be very popular. His connection to Naruto and his own legendary status add depth to the fanfiction. Shikamaru is another character that fans like to see in these stories. His intelligence and laid - back attitude can create some interesting interactions with the main characters.
Sasuke is very likely to be involved. Since he's Naruto's rival and friend, he might be there to witness the meeting of different Narutos. He could be confused at first, but then he'd probably try to figure out how this strange phenomenon occurred. He might also get involved in battles or discussions that the Narutos are having.
Maybe some new rogue ninja group that has a vendetta against the Uzumaki family. They see Boruto as a way to strike at Naruto, so they try to harm him, which then leads to Naruto having to save him.
Sasuke could be involved. Since they have a complex relationship, Sasuke might either be a rival during Naruto's training, pushing him to be better, or he could end up joining Naruto in some training sessions to become stronger together.
Sasuke is an obvious choice. He has a connection to Naruto that goes beyond just friendship or rivalry. He might be the one who first discovers Naruto's predicament and sets out to find a solution. Sakura is essential too. Her skills as a medical ninja are crucial. She could be the one who patches Naruto up every time he gets injured in his fight against whatever is threatening his life. Also, characters like Jiraiya might make an appearance. Even though he's dead in the original story, in this fanfiction, he could come back as a spirit guide to help Naruto find a way to 'refuse to die', giving him advice based on his own knowledge and experiences.
Sasuke is likely to be involved. He and Naruto have a complex relationship and Sasuke has become an ally. He could offer his strength in combat to protect the rebuilding efforts. Also, Sakura. She's a skilled ninja with medical abilities that could be useful if there are any injuries during the process.
It depends on Boruto's personality. If he's the type who likes to explore different ideas and perspectives, then he would probably enjoy reading Naruto fanfiction. He could find some really cool and unique takes on the story he already knows so well. But if he's more of a traditionalist and only wants to focus on the official story, he might not be into it.
Sasuke would likely be involved. He has his own issues with Konoha and might side with Naruto, either out of friendship or his own vendetta against the village. Also, the elders of Konoha like Danzo could be important characters as they might be the ones behind Naruto's banishment.
Sasuke could be involved. Since he has a complex relationship with Naruto, if Naruto becomes 'Red X', Sasuke might be either an ally or an antagonist depending on the nature of 'Red X'. Another character could be Kakashi. As Naruto's mentor, he would surely notice the change and try to guide Naruto through it.
Obviously Naruto and Boruto themselves are very popular. But characters like Hinata, Naruto's wife, also add a lot to the family dynamic in fanfiction. Sasuke is another one, as he has a complex relationship with Naruto and can be involved in the story in many ways. For example, he could be a mentor to Boruto. And of course, the older generation like Kakashi can also be included to give some wisdom and guidance to the family.