Junie B. Jones has a monster under her bed By : Barbara Park Chapter book from a series Characters The main character in this story is Junie B. Jones. Other characters in that book are her Mom, Grandma, Dad, Brother, Ollie and her friends. Setting classroom house bedroom Summary In the story, Junie B.Jones wear a dinosaur dress on her picture day. One of her classmate told her that dinosaurs are scary but monsters are more scary. Junie B. Jones didn’t believe him, but Junie B. got scared and she didn’t go to bed.