To express the concept of "character setting" in Japanese, one would use the phrase "キャラクターセッティング" (kyarakutā settīngu). This term is a direct translation of the English phrase and is commonly used in the context of video games, anime, and manga to describe the process of designing and defining the characteristics of a character, including their appearance, personality, and backstory.

The reason for using "キャラクターセッティング" is due to the Japanese language's adoption of loanwords from English, a practice known as gairaigo. This phenomenon is not uncommon in Japanese, where words from other languages are borrowed and adapted to fit the language's phonetic and grammatical structure. The term "キャラクターセッティング" is a clear example of this, as it combines the Japanese word for "character" (キャラクター, kyarakutā) with the English suffix "-setting," which is adapted to fit the Japanese language.

Data supporting the use of "キャラクターセッティング" can be found in various dictionaries and language resources. For instance, the Japan Times, a major English-language newspaper in Japan, often uses this term in articles related to the entertainment industry. Additionally, the Oxford Japanese-English Dictionary lists "キャラクターセッティング" as a valid term, further solidifying its acceptance and usage in the Japanese language.