What are the 4 characters in a crush by Cynthia rylant?

There are actually only three main characters in "A Crush" by Cynthia Rylant:

* David: The narrator and main character, a young boy who develops a crush on his classmate, Julie.

* Julie: The girl David has a crush on, who is initially unaware of his feelings.

* Mr. DeLuca: David's teacher, who helps David understand his feelings and encourages him to express them.

There is no fourth main character in the story.