Naruto himself is of course essential as the main character. Sasuke would also be great as he has a complex relationship with Naruto and there's a lot of room for development in terms of making up for lost time in their friendship or rivalry. Kakashi could be included as he has a lot of knowledge and experience to offer Naruto in this new time - traveling scenario. And Jiraiya should be in it too, as he was Naruto's mentor and their relationship could be further explored in the context of making up for lost time, like Naruto learning more from Jiraiya earlier.
Definitely include Iruka. He was one of the first people to believe in Naruto. In a making - up - for - lost - time story, Naruto could go back and show Iruka how much he has grown and they could have more meaningful interactions. Tsunade is also a great character to include. She could help Naruto in terms of medical ninjutsu if he decides to learn it earlier to make up for lost time. And Rock Lee should be in it. Naruto could inspire Lee even more in the past, and they could train together, which would be a really cool addition to the fanfiction.
One interesting plot could be Naruto going back in time to his younger self and using his knowledge to prevent some of the tragedies that happened. For example, he could stop Sasuke from leaving the village earlier. Another plot might involve Naruto training harder in the past to become even stronger faster, thus changing the course of some battles. He could also use his future knowledge to befriend characters he didn't get to know well before, like some of the minor ninja from other villages, which could lead to different alliances in the future.
Definitely Naruto himself, since it's a drunk Naruto fanfiction. His friends like Sasuke and Sakura should be included too. Sasuke could react in his typical stoic but secretly concerned way when Naruto is drunk. Sakura could be the one trying to get Naruto to sober up or at least stop making a fool of himself. Kakashi would also be great, as he could have some humorous reactions to Naruto's drunken antics.
Definitely Naruto himself. His determination and positive attitude can bring a lot to the story. Lala too, of course, with her fun - loving and inventive nature. Sakura could also be a great addition. She could interact with Lala in interesting ways, perhaps learning about Lala's technology and applying some of her medical skills to help Lala if she gets injured.
Madara Uchiha would be an excellent character to include. His long - standing relationship with Hashirama, filled with both friendship and enmity, and his connection to Sasuke and the overall ninja world's history would make for a very engaging fanfiction.
Naruto himself is a must - he's the main character after all. Sasuke could also be great as his rival. Their interactions around the kit would be interesting, like if they both wanted it for different reasons. Sakura could be included too, maybe she helps Naruto figure out how to use the kit.
Definitely Sasuke. His complex relationship with Naruto provides a lot of material for fanfiction. You can explore their friendship, rivalry, and how they grow together. Kakashi is also a great character to include. His wisdom and unique jutsu can add depth to the story. And of course, Sakura. Her growth as a kunoichi and her relationships with Naruto and Sasuke can be interesting to write about.
Definitely Naruto himself. His unique abilities and his never - give - up attitude would add a lot to the story. For Salem's side, Salem herself is a must - include as she is the central figure in her world. Also, characters like Sasuke from Naruto could be interesting as his complex personality and powerful skills would create interesting dynamics. And maybe some of Salem's loyal followers like Cinder could also be included to add more conflict.
Obviously Naruto himself is a must - include. His determination and his never - give - up attitude can add a lot of depth to the story. Also, Sakura from Naruto can be a great addition. She can provide some medical knowledge which could be useful in the story. And for Mikan's side, her friends from her own world like Hotaru can be included. Hotaru's intelligence and her gadgets can create interesting plot points when combined with the ninja world.
Definitely Kakashi. Since he has a connection to both Naruto and Tobi (Obito), his presence can add a lot of depth. He can be the one who tries to bridge the gap between Naruto and Tobi, or he could be a source of conflict as he has his own history with Tobi.
Gaara would be an interesting character to include. Since he has his own experiences with being an outcast and finding his place in the world, he could relate to Deidara in some ways. And Gaara's sand powers could create some unique battle combinations with Deidara's explosive art. Rock Lee is also a great choice. His determination and unique fighting style of taijutsu could add a different dynamic to the story. He could also inspire Deidara with his unwavering will to improve.