To me, if there's only one page in a given category, then we do not need that category.
Actually there are more pages in those categories (I just grabbed Norway for an example, it contains three) and I
still think it's more of a burden to lug those dependencies around whenever you edit pages than it'll be worth anytime soon.
However, let me add some more detail: Before, we had two pages on individual Norwegians (Sigrun and Trond), categorized as "characters" (and maybe "people", I don't quite remember when
that got introduced), a page on Norway (categorized as "countries" and "locations") linking to those two Norwegians, and links to the Norway page for all purposes of nation, populace, or language.
Now there's a category "Norwegian", a
page "Norwegian (people)" (marked as a stub) in that category, in addition to Sigruns and Tronds pages,
and redlinks (e.g., in the infobox of the "Norway" page) to a "Norwegian (language)" page that hasn't been created yet. While all the information about Norway as a whole, including a list of known Norwegians, is still snugly sitting in the rather short "Norway" page. (And chances of the comic providing more information about SSSS Norway anytime soon are rather slim, as the expedition's currently heading out into the Silent World.)
While I'm rambling: I think we have two options here, either we keep the categories trimmed down to what we can memorize and handle manually when we edit and categorize pages, or we lay down a systematic array of categories once and for
all the foreseeable future and have pages auto-assigned to them by way of sophisticated templates (you tell the template "it's a character, he's male and a Norwegian, ..." and the page pops up in categories ranging from "characters" and "SSSS storyverse" to "male Norwegian characters that Minna hasn't gotten killed yet").