Thread:PrimalTheGreat3021/@comment-3528596-20170527004337/@comment-104549-20170703210653

Welcome back, then. As a general rule, so-called "compound categories" or "combination categories" aren't allowed. To quote a post elsewhere:

In general, categories are restricted to a single defining characteristic, e.g. Humans or Explorers. Combining the two leads to needless category Balkanization. "Combination categories" risk being so narrow as to lose their utility; "Female Twi'lek Sith Cyborgs from Corellia" is so hopelessly specific that it probably only refers to a single individual. Categories are not supposed to be "categories of one".

Additionally, note the Categorization tutorial: "Only pre-established in-universe categories (or out-of-universe categories for articles about fan fiction) and specially created categories to fit a certain fan series constitute legitimate categories."

For the most part, every category you might feasibly need (other than author-specific categories, like Category:Articles by Sakaros) already exists. There are certainly exceptions; for example, I had to create Category:Mecrosa Order individuals because, while the is a Legendary thing, the specific category didn't exist here because no one had made a Mecrosa character before me. But that's generally the permissible scope of new categories.

If you have any questions or need clarification, feel free to post a reply here.