Abstract
In this paper, we addressed the question of what kind of characters are more likely to be created in fan fiction, a question that has been lacking in conventional studies of fan fiction. To address this, we introduce the agency factor and experience factor as factors that determine the impression of a character from the mind perception model in the field of cognitive psychology. Furthermore, we introduce the concept of classicist and romanticist games and hypothesize that the agency factor contributes to the amount of fan fiction for classicist games, while the experience factor contributes to that for romanticist games. In this paper, "THE IDOLM@STER CINDERELLA GIRLS" was chosen as a representative example of a classicist game and "THE IDOLM@STER SHINY COLORS" as that of a romanticist game. We conducted an online questionnaire survey of several hundred people, calculated the agency and experience of each character, and investigated the correlation with the amount of fan fiction posted on the creative works posting site pixiv. The results support our hypothesis.
https://ror.org/02znffm54 
