Worldbuilding is the process of constructing an imaginary world, sometimes associated with a fictional universe. It describes a key role in the task of a fantasy writer: that of developing an imaginary setting that is coherent and possesses a history, geography, ecology, and so forth. wikipedia.org

Character creation (also character generation or character design) is the process of defining a game character or other character. Typically, a character's individual strengths and weaknesses are represented by a set of statistics. Games with a largely fictional setting may include traits such as

Screenwriting is the art and craft of writing scripts for mass media such as feature films, television productions or video games. It is frequently a freelance profession. wikipedia.org