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.
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 the Fun 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 other than 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.
The guidebook Star and Marco's Guide to Mastering Every Dimension portrays and mentions other members of the Butterfly family, including Skywynne, Queen of Hours, Soupina the Strange, Dirhhennia the Heaped, and Crescenta the Eager. Star vs. the Forces of Evil: The Magic Book of Spells features even more Butterfly family members, including Jushtin the Uncalculated, Rhina the Riddled, Estrella the Drafted, and Comet the Chef.
|Name||Royal alias|| First appearance/|
|Cheek emblem||Wand form||Image|
|(in order of most recent to earliest; asterisk (*) denotes a superseded rule/inheritance)|
|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||Rolling pin|
|Estrella Butterfly||The Drafted||Star vs. the Forces of Evil: The Magic Book of Spells||Five-petaled flower||Pen|
|Celena Butterfly||The Shy||Into the Wand||Crescent moon||Fan|
|Rhina Butterfly||The Riddled||Star vs. the Forces of Evil: The Magic Book of Spells||Infinity sign||Cube wand|
|Crescenta Butterfly||The Eager||Into the Wand||Bunny head||Heart wand|
|Dirhhennia Butterfly*||The Heaped||Star and Marco's Guide to Mastering Every Dimension||Circle||8-ball wand|
|Festivia Butterfly||The Fun||Into the Wand||Four-pointed star|| Goblet (adult)|
|Eclipsa Butterfly (current)||The Queen of Darkness||Into the Wand||Spade||Parasol|
|Solaria Butterfly||The Monster Carver||Into the Wand||Lightning bolt||Sword|
|Jushtin Butterfly*||The Uncalculated||Star vs. the Forces of Evil: The Magic Book of Spells||Four-leaf clover||Alligator cane|
|Skywynne Butterfly||Queen of Hours||Star and Marco's Guide to Mastering Every Dimension||Hourglass||Clock wand|
|Lyric Butterfly||Unknown||Star vs. the Forces of Evil: The Magic Book of Spells||Unknown||Broomstick||None|
|(Characters below are listed by order of introduction, not succession)|
|Soupina Butterfly||The Strange||Star and Marco's Guide to Mastering Every Dimension||Unknown||Unknown||None|
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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- Most members of the royal family are named after astronomical objects. Star and Estrella are named after stars; Moon, Celena, and Crescenta are named after the moon; Eclipsa after the solar/lunar eclipse; Solaria after the sun; etc.