Who are the potential main characters in 'a kid again fanfiction'?

Naruto himself could be a great crossover character. Since Kakashi is his mentor in the original series, seeing them interact when Kakashi is a kid could be really interesting. They could have a different kind of dynamic, with Naruto perhaps being the more experienced one in some aspects. Another potential character is Goku from Dragon Ball. The contrast between Kakashi's ninja skills and Goku's martial arts and superpowers would create a really exciting crossover.

Sora could be a main character as he is often central in the Keyblade universe. His determination and pure heart would make him a key figure in the war. Another could be Riku, with his complex character and his own journey of growth and redemption.

The protagonist from the original work can be a main character. For instance, if it's a fanfiction based on a superhero story, the superhero could be the main character who changes their tactics. Maybe they stop relying on their superpowers all the time and start using their intelligence more. Another potential main character could be a sidekick who steps up and changes their tactics to fill in when the hero is incapacitated. For example, they might start using some of the hero's gadgets in a different way than the hero does.

A young girl who has always been fascinated by Sakura could be a main character. She might be on a journey to see the most amazing Sakura blossoms.

A new, original character could be the main character in a Naruto chains fanfiction. This character could be from a small, unknown ninja village and possess a unique ability to control chains made of some special material. They could come to the Hidden Leaf Village and get involved in the events there, interacting with the well - known Naruto characters.

It could be a young hero and a mysterious guide. The hero is on a journey with a strong will to achieve something great, and the guide, who initially seems cold, warms up to the hero as they travel together, and love starts to develop between them under the will of the quest.

A powerful sorcerer or priestess who has a lot of influence over the religious and magical aspects of Babylon could be a main character. They could be involved in political intrigues as they try to use their powers to further their own agendas or protect the kingdom. Another potential main character could be a foreign diplomat who comes to Babylon and gets caught up in its complex web of power and politics.

A fallen angel could be a great main character. They have already experienced a fall from grace and now are faced with these 108 earthly temptations as a chance for redemption. They have knowledge of both good and evil, but still struggle with the earthly allures.

A young inventor could be a main character. He is full of new ideas and is trying to make Star City a better place with his inventions.

Obviously, the drunk dragon itself can be the main character. It could have a unique personality, perhaps being a bit clumsy and overly friendly when drunk.