Fanlore hasn't ever created categories for genres of source texts, unless you count anime. For example, we have a Live-action Television category, but no Wild West show category. We have a page instead. A Tabletop RPG category would be fine; high fantasy RPGs would not. This may be an unwritten rule, but a) it doesn't match the current category pattern, b) we don't want to encourage people to create pages about nonfannish things by having too many canon-focused categories, and c) fanworks have genres, too, so there's a lot of potential for confusion. If some of those Canon Type subcategories get to be unmanageably huge, we might want to look at breaking them down further with genres, but I think it will cause problems.
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