Shura was a Japanese word that meant " war,"" struggle," or " conflict." In anime, novels, games, and other literary works, Shura was usually portrayed as a fierce, cruel, and warlike monster or demon.
Asura was the Japanese word for Asura, meaning "fighter" or "combatant". Asura was a monster in ancient Chinese mythology related to the Dragon God of the Eastern Sea. According to legend, Asura was originally a giant dragon in the Eastern Sea that had become an Asura due to excessive cultivation. Shuras were usually portrayed as powerful, ferocious, and cruel demons or monsters who fought fiercely with humans. In anime, novels, games, and other literary works, Asura was often associated with elements such as demons, monsters, and war.
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Not "cultured scum" was not an idiom. This term is usually used to describe people whose behavior does not conform to moral norms or has low moral standards. A person with elegant and civilized behavior may be described as "gentle", while a person with uncivilized and immoral behavior may be described as "scum". This phrase came from novels like " Battle Through the Heavens ".