The obvious main characters would be the donkey and the dragon.
Obviously, the female donkey would be one of the main characters. And there could be a friendly seagull that helps her navigate the island.
Obviously, the donkey and the dragon are the main characters. Sometimes there might be other supporting characters like a wise old owl or a mischievous squirrel that add more elements to the story.
It could be about a donkey and a dragon becoming friends in a magical land. Maybe the donkey is lost and the dragon helps it find its way home.
A wise old hermit could be a main character. The hermit, living in seclusion, has knowledge about the dragons that no one else does. When the last dragon comes to him for help, he uses his wisdom and his connection to nature to guide the dragon on a journey to restore its species, all while facing various challenges along the way.
A brave knight could be a main character. They might be on a quest to find the dragon knot to save their kingdom from a dragon threat, believing that the knot holds the key to controlling the dragons.
Maybe a new Saiyan who was born on a different planet and has a different understanding of Saiyan culture. He or she could come to Earth and interact with the existing Dragon Ball characters, bringing new fighting styles and a fresh perspective to the story.
The main characters could be a young adventurer who stumbles upon the blue dragon and the delphinium. Or perhaps a wizard who has been studying the delphinium's magical properties and then has an encounter with the blue dragon.
Donkey is a top pick. He has so many funny lines and his friendship with Shrek is a big part of what makes the Shrek movies great. In fanfiction, he can be put into all sorts of crazy situations. The dragon is also quite popular. Her unique look and her relationship with Donkey add a lot of interesting elements. Sometimes, the dragon is written as a more gentle and motherly figure, which is different from her initial appearance in the movie.
The main character is likely the wonky donkey itself.
The main characters are the boy and the donkey, of course.