Cala Maria has a physical appearance reminiscent of a typical humanoid female character. She is a giant, tall, slender mermaid with fairly wide hips and a small waist. She has pale skin, a small button-nose, and two scar-like markings on the bicep of her left arm (though how or why she got them is unknown, but it could be a reminiscent of eel bite marks).

On her head, she has a dead, purple octopus with pale lavender eyelids over X-crossed eyes, with a lighter purple coloring.