She is shown to be a young woman, with short black hair. She wears a light pink dress that goes down to the middle of her thigh, and has a red medical cross on the left side of her chest. She also wears a small light pink nurse hat, and a pair of matching shoes.
She was helping transport a wounded man to a nearby hospital, when they encountered Saint Charloss, a Tenryubito. Saint Charloss refuses to let Marie pass with the wounded man, kicking the heavily-wounded man to the ground and saying that he will help him die. While Marie was kneeling beside the victim, shocked at Charloss' cruel behavior, Charloss noticed her beauty and forced her to come with him in order to become his thirteenth wife against her will. When her fiancé, who was also helping to transport the wounded man, got up and pleaded with Charloss not to take Marie away, he shot him for "daring to stand in his presence".
She was set free along with the other slaves of Saint Charloss's family after Luffy's attack on the Tenryubito.