Maou: demon lord or demon king?

The hero has been summoned to defeat the maou, and depending on the book you're holding that's a Demon Lord, a Demon King, a Devil King, an Overlord or, in one stubborn edition, a Dark Lord. Readers who've seen all five want to know whether maou means demon lord or demon king. It means both and neither, and the choice tells you what kind of story the translator thinks it is.

What maou is

Maou (魔王) is two characters: ma, the one that shows up in magic, demon and evil, and ou, king. It's the ruler of the mazoku, the demon race, and in the genre it's the fixed opposite of the yuusha, the hero. The word has real age behind it, having been used for the tempter in Buddhist scripture and for the Devil in older translations, and modern fantasy inherited it from role-playing games, where the maou sat at the end of the last dungeon and the game was over when he fell.

What it means in the source culture

In a Japanese reader's ear, maou is a job before it's a person. It's the title of whoever leads the demons, the way "emperor" is a title, and the word carries no judgment about how evil the holder is. That's why so many web novels can have a kindly maou, a retired maou, a maou who runs a farm or a girl who inherited the position at twelve: the word only says who's in charge. It also comes in grades. Daimaou, the great demon king, is the bigger one, and a book can have several maou under a single daimaou, which English usually flattens.

There's a second use, playful and common, where maou is just a nickname for anyone terrifying: a strict teacher, an unbeatable gamer, the manager on the late shift. Light novels use both.

How translators handle it

"Demon Lord" is the most common English choice, and it sounds like a fantasy villain, which is the point. The trouble is that "lord" is vaguer than "king": a lord can be one of many, and the sense that the maou is the head of a state, with a castle and a court and succession problems, gets softer. It also makes daimaou awkward, since "Great Demon Lord" sounds like a promotion nobody asked for.

"Demon King" is more literal and sits better in books where the demons are a nation. It reads as a political title, and books about a maou who has to govern, sign treaties or worry about the harvest tend to prefer it. What it costs is gender: a female maou becomes a "Demon King" or an awkward "Demon Queen," and the original didn't have to choose. Some editions keep "Demon King" for the office regardless of who holds it, which is faithful and takes a page to get used to.

"Devil King" and "Overlord" are older or rarer, and "Dark Lord" borrows from English fantasy, which is a way of saying the translator wanted the reader to think of a specific kind of villain, and to stop thinking about Japan.

What we'd choose

Demon King when the book treats the maou as a ruler of a people, and Demon Lord when it treats him as a monster at the end of the road, decided once per book and never changed. For daimaou, Great Demon King, and for the nickname use, whatever the scene needs, since a teacher called maou by his students is a joke that "Demon King" carries fine. And a female maou keeps the title as written unless the original plays with her gender, in which case the translation should play with it too. If a village girl is told the Demon King is coming and pictures a giant, and the Demon King turns out to be a tired woman with a ledger, the joke only works if the title stays "King."

How to read it comfortably

Read maou as a chair rather than a character. Whoever sits in it is the demons' ruler, and the book will tell you separately whether they deserve to be fought. Once the title stops meaning "evil" in your head, the whole shelf of reluctant, decent or bored demon kings stops looking like a paradox; they're stories about a job.

A translation that picks one title for the office and holds it from first chapter to last keeps that job legible; you can read it in Crossleaf.