I want to ask why they are all called Athina Benner.

There is a tradition in the Japanese animation industry that different authors will sell their own fan stories on Comicket twice a year. The so-called fan chronicle is rich in content, but a large part of the theme will be popular works of that year. According to the statistics in the venue, we can know the most popular works and characters in the fan chronicle of that year. Because fan chronicles are also commonly known as notebooks, the most popular figures will get the title of "king of notebooks" (generally women), which generally refers to the state of high frequency in fan chronicles, especially adults. The winners of this title include Athina (Benna), Shima Peak (Benfeng) and Ibaraki Kasen (The Scarlet Letter Fairy). Later, some potential characters will be directly titled "Book X".