Mozart is a thin woman with very long dark maroon hair, which is partitioned into two large horn-shaped braids to the left and right of her head which resemble a jester's hat; parts of these braids are pink. She has purple eyes. She wears a pink collared shirt with horizontal purple stripes, a maroon skirt, striped tights, and a light purple cape.
As a daughter of the Charlotte Family, Mozart is an executive of the Big Mom Pirates and she holds a certain amount authority within her crew. Her combat powers and abilities are unknown, but she is presumably strong as she is an officer of a Yonko crew.
Mozart possesses a strong will, being able to withstand a burst of Big Mom's Haoshoku Haki and remain conscious from her loud scream.
Mozart is likely named after Mozartkugel (meaning "Mozart ball" in German), a small, round sugar confection made of pistachio marzipan and nougat that is covered with dark chocolate. This fits with the food-themed themes of the Charlotte Family.
She may also be named after the famous Austrian composer Wolfgang Amadeus Mozart, fitting with the music-themed names of some Charlotte Family members.