Mustache Girl is a small human girl with blonde hair styled into two loose pigtails, held together with purple ribbons and turquoise beads. She has golden-yellow eyes and her most recognizable feature is her small blonde mustache. She wears a red hooded cloak fastened at the front by a golden medallion with a star engraved into it. Underneath, she wears a pink tunic with a purple sash, purple pants, and green shoes. Mustache Girl is an unruly, rebellious, and snarky kid with a strong sense of justice. She tends to divide people into "good guys" and "bad guys" and has little patience for those she considers evil. Her determination to fight the Mafia eventually becomes extreme, especially after discovering the power of the Time Pieces. Despite her later actions, she wasn't always like this; she was originally much more innocent, friendly, and welcoming before the Mafia's takeover of her home changed her outlook.