Horse girl. Has black hair done up in massive twintails - who are so marvelously big, they warrant having saddle-looking leather covers - with slightly drilled-shaped sidelocks. Also has brownish orange star-crossed eyes. Marvel wears a vaguely flower-shaped cloth ear ornament on her right ear.
Marvel is easily excitable and regularly peppers her speech with the word "marvelous" as an allusion to her name.