>>6115266pepe can't be an avatar for the same reason cirno can't be an avatar.
an avatar's primary purpose is to identify the poster (and in the case of imageboards they have a secondary purpose of allowing the user to emote).
when there's dozens of people posting the same character, that character can no longer serve the primary purpose of an avatar.
anzu fagmark and Lapis Lazuli russian survey poster on the other hand, those are avatarfags.
