Su usually refers to someone's talent, charm, personality, etc. It can also refer to someone's beauty, cuteness, charm, etc. In novels, anime, games, and other fictional works, a person who was very popular usually meant that the person had outstanding talent, charm, or personality, which aroused the interest or love of readers or audiences. However, it should be noted that this usage is not very common and may not be completely correct. The specific explanation depends on the specific situation and the background of the work.