There might also be a new breed of summon animals that are native to the air space. These could be large, flying creatures that can be summoned by the characters. They would have their own personalities and abilities, like a giant eagle - like creature that can sense danger from miles away and has a powerful screech attack.
There could be air - based ninja clans with their own unique abilities. For instance, a clan that can manipulate air pressure to create powerful blasts or shields. These new characters would bring fresh fighting styles to the Naruto world.
There could be a hermit who takes Naruto in during his banishment. This hermit could teach him some ancient ninja techniques. Another new character might be a fellow outcast that Naruto meets, and they form a bond while living on the fringes of society.
Maybe a group of rogue ninjas who initially see Naruto as a target but then end up joining forces with him. They have different skills and personalities that add to the story.
There could be their children's friends. Maybe a young ninja from a far - off village who comes to study in the Hidden Leaf. His unique abilities and different cultural background could bring new elements to the story.
Maybe a mysterious ninja from a hidden clan shows up. This ninja is intrigued by Naruto's situation of being left behind by Sakura and decides to help him. They could have some really cool powers like the ability to manipulate shadows in a different way than the Nara clan. Also, there could be a healer from a neighboring village who comes to Konoha. She helps Naruto deal with his emotional wounds from being left behind, and in the process, they become good friends.
A new Akatsuki member, a young and powerful ninja who has a personal vendetta against Naruto. Their clashes could add a lot of drama and action to the fanfic.
It's hard to say for sure. But perhaps there could be ninjas from a far - off land that we haven't known about before.
Perhaps an ancient evil spirit that was awakened due to some of the events related to Naruto's regeneration. This spirit could have its own motives, like corrupting the ninja world and turning it into a place of chaos and destruction.
A mischievous cat could be added. The cat could be jealous of Air Bud's popularity and constantly try to play pranks on him. Another potential character could be a wise old owl. The owl could give Air Bud advice on how to deal with difficult situations or new challenges in his adventures. And a little girl who has just moved to the neighborhood and befriends Air Bud could also be a great addition. She could be the one to introduce Air Bud to new games or places.
There could be a group of orphans who have banded together and developed their own unique style of ninjutsu out of necessity. These orphans could add a new dimension to the story as they struggle to survive in a world full of powerful ninjas while also trying to find their place in it.
Perhaps an alien with special abilities who becomes a central figure in the story. They might have a unique perspective on the events in the novel due to their different biology and culture.