Lelouch could be a main character. Since he is a key figure in the Code Geass world which has Britannia. He and Naruto might start as rivals due to their different approaches to justice but later become allies. Suzaku could also be involved. He might be initially suspicious of Naruto but come to respect him as Naruto shows his good intentions in the Britannian world.
Kallen could play a role. She is a strong - willed fighter in the Code Geass world. She might see Naruto as an interesting addition to the fight against Britannia's tyranny. And maybe some of Naruto's original friends like Sakura or Kakashi could somehow be transported to this world too, adding more complexity to the relationships and the story.
C.C. could be an important character. She might be intrigued by Naruto's unique powers and his different world origin. She could offer her knowledge and help to Naruto in the Britannian court intrigues. Also, the Emperor of Britannia himself would be a significant character. Naruto would have to interact with him, either as an ally or an adversary, as he tries to make changes in Britannia.
One possible plot could be that Naruto is somehow transported to the world of Code Geass where Britannia exists. He might be mistaken for a noble or a prince due to his unique abilities and charisma. He could then use his ninja skills to navigate the complex political and social structure of Britannia, while also trying to find a way back home.
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, the Jedi who adopt Naruto would be main characters. For example, a Jedi Master like Obi - Wan Kenobi could be the one to discover Naruto and take him under his wing. Another could be Yoda, who would be very interested in Naruto's unique abilities and would play a role in his training. There could also be other young Jedi trainees who become Naruto's friends or rivals during his time at the Jedi temple.
Sasuke could be one of the main characters. He might initially be skeptical about Naruto's new identity but then come to accept it and fight alongside him. Sakura could also be there, perhaps using her medical skills to help Naruto when he gets injured during his adventures related to his Pegasus heritage.
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.
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.
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.
Hinata could be one of the main characters. She might support Naruto in his efforts to rebuild the Whirlpool Village, both morally and with her Byakugan skills which could be useful for scouting and security.
An elf who adopts Naruto could be a main character. This elf might be an elder with great wisdom and magical powers. They see something special in Naruto and take him under their wing. Another character could be an elven child who becomes Naruto's friend. They teach each other about their respective worlds and grow together.
Sakura would be a likely main character. She is a skilled medical ninja, so she could play a crucial role in ensuring the health of those involved in the repopulation efforts. For example, she could develop new medical procedures to help with childbirth or deal with any potential health issues that might arise during pregnancy.