The landscapes represent a typical fairytale land, where magic and mystical creatures exist. However, beyond the comfort of the Royal Family's castle, Mewni's citizens do not seem to have the best condition of life: the streets are rather dirty, with seemingly widespread poverty. Even their way of life is brutal and usually involves mass destruction and certain death. The creatures that roam the forestlands are mostly all predatory, including plant-life.
- In the episode "Mewnipendance Day", it is revealed the Inhabitants of Mewni are called "Mewmans", a portmanteau of "Mewni" and "humans".