Arnold Pelstein is one of the main protagonists and students of Ms. Frizzle's class of The Magic School Bus. He does not like Ms. Frizzle's field trip because he wants to have a real better field trip instead of his teacher's magical field trips that the school bus takes him and his classmates to a magical educational adventure in the world or in the environment in the school field. At best he is usually an unwilling participant. Depite this, he has shown bravery when he's need to, and he's very loyal when it comes to his teacher and his classmates. He is also Phoebe Terese's love interest.