Marisol is a small hamster with brown fur, a cream-colored underbelly, pink nose and paws, and large black eyes.
In "Girls' Day Out", Marisol appears as the class pet for Star Butterfly's math class, taught by Miss Skullnick. When she looks as bored as Star is, Star sets her free out the window. Miss Skullnick gives Star detention for this and tells Marco to get Marisol back.
Marco tracks Marisol to a drainage pipe on the side of the school, but he is unable to reach her, and even gets his arm trapped in the pipe, causing the Echo Creek fire department to get involved. Miss Skullnick happily retrieves Marisol, but when she goes to check on the kids in detention, a prank by Star and Janna nearly causes Marisol to be eaten by a snake.