Sasuke could be one of the main characters. Maybe he and Naruto have a new kind of relationship now that Naruto has retired from the ANBU. They could be working together to protect the village in a different way.
Kakashi is likely to be a main character too. As Naruto's former teacher, he could be guiding Naruto in the ANBU or having some sort of conflict with the ANBU higher - ups over Naruto's training and assignments.
One possible plot could be Naruto retiring from the ANBU due to the toll it has taken on his mental and physical health. He might then focus on mentoring the next generation of ninja in Konoha, sharing his unique skills and experiences.
Bulbasaur - girl might be a great choice too. Her connection with nature and plant - based attacks could add an interesting dynamic. She could help Naruto understand the Pokemon world better, especially when it comes to things like finding herbs or dealing with forest - related challenges. There could also be a fiery - tempered Charmander - girl who provides a contrast to Naruto's more easy - going nature and has her own set of powerful fire - type attacks.
Obviously, Naruto is one of the main characters. He brings his own set of skills, values, and personality to the ANBU setting. Another main character could be Kakashi. Since he has experience in ANBU and also has a connection with Naruto, he could play an important role in guiding Naruto or being involved in the same missions.
Besides Naruto, there might be a young girl named Hana. She could be from a family that was once friends with Naruto's family but now has mixed feelings about him. She's conflicted between her family's stance and her own sense of justice. And then there's Kenji, a strong - willed boy who was also shunned in a different way and he and Naruto form a bond based on their shared experiences.
One of the main characters could be Fleur Delacour. Since she's from Beauxbatons, she might be the one to first interact with Naruto. She could be curious about his strange abilities and help him adjust to the school. Another could be a male student at Beauxbatons who is initially jealous of Naruto getting all the attention but later becomes his friend after seeing his true character.
Sasuke could be one of the main characters. He might be suspicious of Naruto's new powers and how they change Naruto. Their relationship could become more complex as Sasuke tries to understand if Naruto is still the same person he knew.
Well, I think Zabuza could be a key character. Maybe he has some unfinished business in Wave and Naruto's arrival stirs things up. And the villagers of Wave, like Tsunami, could be main characters too. She could provide Naruto with a place to stay and offer motherly advice. There could also be new, original characters created specifically for this fanfiction, like a young ninja in Wave who looks up to Naruto.
Maybe there are new characters created specifically for this fanfiction. They could be local inhabitants of the wet area, such as a water nymph - like character who has knowledge about the secrets of the place and either helps or hinders Naruto's journey.
There could be a leader of the horde. This character might be initially skeptical of Naruto but later comes to respect him. Another character could be a young member of the horde who looks up to Naruto as a role model and wants to learn from him.