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According to a historical report delivered by Star Butterfly in "Mewnipendance Day", the first Mewmans came to Mewni a long time ago and made a settlement. One day, vicious monsters appeared to claim the Mewmans' land. The Queen at the time (Star's ancestor) used her magic to transform the Mewman peasants into a powerful army, and they drove the monsters away. However, it has been suggested that the monsters were actually peaceful, and that the Mewmans drove them off the land that was rightfully theirs.
Mewmans for the most part are indistinguishable from humans, but they have some unique characteristics that make them stand out, such as wings. Some Mewmans, such as Star Butterfly and Queen Butterfly, have marks on their cheeks that change depending on their mood. At the age of puberty, female Mewmans go through mewberty, a metamorphic phase that lasts for several hours.
The Mewmans of Mewni are governed by an absolute monarchy, which is currently ruled by Queen Butterfly and King Butterfly. Though they are aware of Earth, most Mewmans have a limited understanding of Earth culture, including school tests and plumbing. There is also a considerable divide between the upper and lower classes, as the Mewnian upper class consists of several levels of castles and the lower class lives in poverty.
According to Star and Marco's Guide to Mastering Every Dimension, the royal lineage of Mewni is "matrilineal", meaning the queen holds more authority than the king, and the throne is handed down from the queen to her firstborn daughter. As a result, King River Butterfly (born River Johansen) took his wife's last name upon their marriage.
Mewman civilization at the start of the series appears to be as developed as 18th- to 19th-century America. Warnicorns and manticore-drawn carriages are used for transportation, and pig-goats are used as livestock.
The Mewmans have a low tolerance of monsters; in "On the Job", King Butterfly attempts to stop some from stealing his corn by catapulting fireballs at them.
Most Mewmans share a deep love of corn. During the Butterfly-Johansen reunion seen in "Game of Flags", corn is the only foodstuff served, and all the guests eat plenty of it.
As explained in "Face the Music", each Mewman princess is assigned a "Song Day", on which the royal songstrel writes a song about the princess to serve as their official introduction as future queen of Mewni.
- Butterfly family
- Royal guard babysitter
- Mina Loveberry
- Johansen family