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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. This phase causes the individual to adopt insect-like attributes such as wings and additional arms. In adulthood, Mewmans may transform back and forth between their normal and mewberty appearances, such as Queen Butterfly.
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.
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. It was however seen that they tried to make peace with them before as shown in "Moon the Undaunted" when they proposed signing a peace treaty with them before Toffee went rogue and took half of a monster army to do what he pleased.
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. Also, the only food supplies held in the Wellspring's vending machine, as seen in "Return to Mewni ," are various forms of corn, suggesting their main diet consists primarily of corn.
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
- Mime Girl
- Johansen family