A young, orphaned shinobi with no known clan but extraordinary skills. He could be a wildcard in the clan wars, not bound by traditional clan loyalties.
A foreign shinobi who comes to the Naruto world during the clan wars. He has different techniques and a different view on war, which could either help or hinder the situation depending on his motives.
A female shinobi from a newly discovered clan that has been hidden away for centuries. Her clan's unique abilities and culture could add a fresh perspective to the wars.
A shinobi from a hidden village that was destroyed long ago. This character could carry the secrets and unique jutsu of their fallen village and seek revenge or redemption in the Naruto world.
A vampire scientist. This character could be researching ways to create a new type of vampire that is immune to the weaknesses of traditional vampires, like sunlight or silver. Their experiments could cause a stir among both the vampire and lycan communities.
Naruto himself could be a main character, using his skills and influence to try and stop the clan wars. Another could be a young shinobi from a minor clan who has a special ability and wants to prove their clan's worth. And Sasuke could also be involved, perhaps having his own motives related to the clans.
A character who is a descendant of the original creators of the Fierce Diety form. This character could have knowledge about the form that Naruto doesn't and could either be an ally or an antagonist depending on their motives.
A mysterious shinobi from another village who has a connection to the ex - ANBU's past missions. This character could bring in new elements of foreign shinobi culture and different fighting styles.
A female shinobi who defies the traditional gender roles in her clan during the wars would make an interesting main character. She could break barriers and show that women can be just as powerful and important in the shinobi world as men, and her actions could have a significant impact on the outcome of the clan wars.
A group of nomadic mice. They have different skills and traditions compared to the Redwall mice. Their arrival at the abbey could cause some cultural clashes at first, but eventually, they could learn from each other and contribute to the abbey's growth. This would add more diversity to the characters in the fanfiction.
A young stargazer from Earth could be a new character. This character could be someone who has always been fascinated by the stars and dreams of traveling to other planets. When the Little Prince lands on Earth again, they meet and the stargazer becomes his guide on Earth, showing him all the new things that have happened since his last visit. Another potential character could be a talking moonbeam. It could offer the Little Prince advice and wisdom, as well as some magical abilities to help him on his journey.
A new character could be a therapist who has a unique approach to helping the main character. This therapist could introduce new ideas and methods of healing that the main character hasn't encountered before.
A healer from a far - off land could be an interesting addition. This character could bring in new knowledge of magic and medicine that the existing characters are unaware of. Maybe they have a special connection to nature that allows them to heal in ways not seen before in the story.