Marshall Mallow looks like a white marshmallow, being from Candy Country. He wears a blue suit.
He is concerned with following rules given to him and has a strong sense of duty. At the beginning of the film, he seems to expect orders, as shown by how he asked Dorothy is her invitation to come to the emerald city was an order. He also stopped trying to convince Dorothy to not go alone when Dorothy ordered them to not go with her, showing he was still concerned with following orders.