The main character is a boy who wants freckles. There's also the boy who sells him the freckle juice recipe.
The most important character is the boy who is envious of the freckles on his classmate. He drives the story forward by his strong desire for freckles. And then there's the other boy who has the 'freckle juice' recipe. He's kind of a clever character who takes advantage of the first boy's envy. These two characters are at the heart of the Freckle Juice reading story and their interactions create all the fun and chaos in the story.
There's the protagonist, a young boy who is fixated on getting freckles. He's naive and eager. Then there's the boy who comes up with the idea of 'freckle juice' and sells the recipe. This character is more sly and entrepreneurial in a way. There might also be other characters like the classmates who have freckles that the first boy admires, but the two boys mentioned above are the main ones in the Freckle Juice reading story as they are the ones involved in the main plot of creating and drinking the freckle juice.