I don’t know for sure but maybe it’s bc we also have pages for real ppl that contributed to ToG on the wiki. So the real ppl would only go in the female/male categories

Hi, it's because the Female characters category should have the female characters of non-Fae species only, and the category Females should have only characters of the Fae species that are female, same for Male characters and Males. I was organizing the categories a while ago and came across that explanation. Also, there are many nonsensical categories in the wiki that should be removed. I come here from time to time and organize a bit but it's a lot to do.

You can see here the note from the admin when they created the page: https://throneofglass.fandom.com/wiki/Category:Male_characters?action=history

Edit: I noticed that the confusion is because another user removed the note from the admin as you can see in the page's history, I've reverted it.

@Tamirobson It still feels redundant but thanks for explaining.