While it is unknown when this began, a family tradition was established which stated that when the newest heir to the throne turned fourteen years old, they would get a magical wand that has the capacity to destroy the universe if it fell into the wrong hands. The family name and lineage appears to be matrilineal, passing from mother to daughter. While male Butterflys do exist, they are noticeably in fewer numbers.
Several members of the Butterfly family have marks on their cheeks (referred to in Star and Marco's Guide to Mastering Every Dimension as "cheek emblems"): Star has hearts, Queen Butterfly has diamonds, Etheria has five-pointed stars, Solaria the Monster Carver has lightning bolts, Eclipsa the Queen of Darkness has spades, and Miss Heinous (revealed in "Monster Bash" to be Eclipsa's daughter Meteora) has clubs. These marks are the result of a longtime exposure to magic.
In "Game of Flags", most members of the Butterfly family are portrayed as exceptionally well-mannered yet uptight, and they look down on the loud, obnoxious, and unrefined Johansen family of King Butterfly. However, they can become just as ruthless and savage as the Johansens in their determination to win the titular contest.
The guidebook Star and Marco's Guide to Mastering Every Dimension portrays and mentions other members of the Butterfly family, including Skywynne the Queen of Hours, Soupina the Strange, Dirrhennia the Heaped, and Crescenta the Eager.
In "Butterfly Trap", it is revealed that Eclipsa's ex-husband, King Shastacan, wanted nothing to do with Eclipsa's half-monster daughter, Meteora. So he had the Magic High Commission swap out Meteora with a Mewman peasant and had the official records changed to say that Festivia was the heir to the throne. This means that all future members of the Butterfly family aren't actually related to Eclipsa and puts their royalty into question.
In "Conquer", Meteora returns to Mewni to reclaim her birthright. After successfully conquering the kingdom, she destroyed all tapestries of queens after Eclipsa (including Moon, Solaria, and Celena). After Eclipsa defeats Meteora and changes her back into a baby, Star gives the royal wand back to Eclipsa, conceding the Mewni throne to her.
|Name||Royal alias|| First appearance/|
|Cheek emblem||Wand form||Image|
|(in order of most recent to earliest)|
|Star Butterfly (princess)||The Underestimated||Star Comes to Earth||Heart||Wand|
|Moon Butterfly||The Undaunted||Star Comes to Earth||Diamond||Scepter|
|Comet Butterfly||The Chef||Return to Mewni||Butterfly||Unknown|
|Celena Butterfly||The Shy||Into the Wand||Crescent moon||Fan|
|Festivia Butterfly||The Fun||Into the Wand||Four-pointed star|| Goblet (adult)|
|Eclipsa Butterfly (current)||The Queen of Darkness||Into the Wand||Spade||Parasol|
|Eclipsa Butterfly's mother||Unknown||Moon the Undaunted||Unknown||Unknown||None|
|(Characters below are listed by order of introduction, not succession)|
|Solaria Butterfly||The Monster Carver||Into the Wand||Lightning bolt||Sword|
|Crescenta Butterfly||The Eager||Into the Wand||Bunny head||Wand|
|Skywynne Butterfly||Queen of Hours||Star and Marco's Guide to Mastering Every Dimension||Hourglass||Clock|
|Soupina Butterfly||The Strange||Star and Marco's Guide to Mastering Every Dimension||Unknown||Unknown||None|
|Dirrhennia Butterfly||The Heaped||Star and Marco's Guide to Mastering Every Dimension||Circle||8-ball wand|
|Jushtin Butterfly||The Boy Queen||Star vs. the Forces of Evil: The Magic Book of Spells||Four-leaf clover||Unknown|
|Estrella Butterfly||The Drafted||Star vs. the Forces of Evil: The Magic Book of Spells||Five-petaled flower||Pen|
|Rhina Butterfly||The Riddled||Star vs. the Forces of Evil: The Magic Book of Spells||Infinity symbol||Unknown|
Other family members
|Name|| First appearance/|
|Meteora Butterfly||St. Olga's Reform School for Wayward Princesses||Club|
|Etheria||Game of Flags||Five-pointed star|
|Heartrude||Game of Flags||None|
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