Queen Moon Butterfly (also known as Moon the Undaunted) is a supporting character in the Disney XD animated series, Star vs. the Forces of Evil. She is the wife of River Butterfly, and the mother of Star Butterfly.
She is voiced by Grey Griffin in the English version of the cartoon, and by Alessandra Korompay in the Italian version of the cartoon.
Queen Butterfly is serious most of the time, having a low tolerance for anything messy or destructive. Despite being the queen, Queen Butterfly acts as the true ruling monarch of Mewni and always has the well-being of her kingdom in mind, to the point she is unable to express interest in anything else. This often causes her to appear cold towards others. Despite her overbearing strictness, she truly loves and cares for her daughter.
Queen Butterfly has a slender figure and taller than her husband. She has long pale blue hair with three bangs that resembles her daughter's, often shaped in a heart. She has blue eyes, wears pink lipstick, and purple diamonds on her cheeks. She wears a golden crown with a purple diamond in the center. Her royal outfit includes a light blue and periwinkle gown, the skirt somewhat resembling the shape of a heart, with long blue gloves.
From "Mr. Candle Cares" onward, Queen Butterfly had slightly altered her look; her crown now has a gold diamond-shaped attachment with a purple diamond in the center, from which two strings of pearls curl around the sides of her hair. Her ears are visible and wears gold diamond-shaped earrings with purple diamonds embedded in them. She now wears purple lipstick.
In her Mewberty form, Moon has large butterfly-like wings and six arms.
- Her English voice actress, Grey Griffin, also voiced Kitty Katswell, Frankie Foster and Wonder Woman (DC Superhero Girls).
- In Season Two, Queen Moon receives a redesign to her appearance.
- In "Into the Wand", it is revealed that Moon was the one who first defeated Toffee and severed the middle finger on his right hand.
- Moon is also the newest member of the magic high commission.
- Moon received Lil Chauncey the day of her seventeenth birthday.
- In "Moon the Undaunted", its is revealed that Moon became queen when she was three years older than her daughter because her mother Comet was killed by Toffee and his army of monsters.
- When Moon was a princess she wore the same crown that her daughter now owns and wears on special occasions.
- Moon was the second known queen to begin her reign at the age of 17 years old, the first known queen being Skywynne Butterfly (Eclipsa's maternal grandmother).
- Though Skywynne took the throne because her mother Lyric stepping down out of boredom.