I did change the name as I was wondering a couple of things. Why do some characters have this kind of page while some characters have their own page even if they were One-Shot Characters as well? Why do not all characters have a page?
Sorry for the late reply. Some characters are co-stars because they were credited that way in the episode, while others were credited as guest stars, a more significant role in the episode, hence a character page. Co-stars that appeared in more than one episode, however, have an article dedicated to them.