Definitely Naruto and Lamia are the core. But adding Hinata could bring a different dynamic. Maybe Hinata could be a bit jealous of Lamia's closeness to Naruto at first. Also, Jiraiya could be a great addition. He might have some knowledge about Lamia - like creatures from his travels and be able to give Naruto some advice on how to interact with her. Shikamaru could also be included. His strategic mind could help in planning against any threats that come up in the fanfiction.
Well, Naruto himself is a must - include. His positive attitude and powerful ninja skills can drive the story forward. And of course, Lamia as the main other character. Then characters like Sasuke could also be interesting to include. He could be skeptical of Lamia at first, creating some tension in the story. Another good character would be Kakashi. His wisdom could be useful in guiding Naruto and Lamia in their adventures or dealing with any conflicts that arise.
Kakashi could be a good character to put in. His experience and wide range of ninjutsu could be useful in the story. For Thalia's side, Luke could be included. His conflicted nature and his skills would add a layer of intrigue, especially when interacting with Naruto and Thalia, as they try to figure out whether to trust him or not.
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.
Obviously, the Sannin themselves - Orochimaru, Jiraiya, and Tsunade are must - includes. But Naruto can also be a great addition as he has connections to Jiraiya. His presence can add a new dynamic as he looks up to the Sannin and tries to learn from their experiences. Another good character could be Sasuke. His dark past and thirst for power can contrast with the Sannin's different outlooks on power and morality.