Categories must have at least two different articles—excluding the category topic's article—with the exception of the following cases:
Species
Starship classes
Droids by model
Products by company (both IU and real-world)
Images and audio files of a particular subject
Images and audio files from a particular piece of media
Images and audio files by a particular creator
Issues, books, or other media in a particular series
Categories should reflect a single shared attribute of the articles, and intersectionality should be kept to a minimum.
This includes unidentified-article categories; categories such as "Unidentified humans" should not be used as it represents an intersection between Category:Articles with conjectural titles and Category:Humans. Categories such as Category:Unidentified spacecraft are permitted, as they do not cleanly represent an intersection between conjectural-titles and a single spacecraft category.
There are some exceptions to this rule, as illustrated in cases like the following:
Category:Katana fleet, which is a fleet consistently entirely of Dreadnaught-class cruisers that was commissioned for the Galactic Republic; thus, ships in that category can use the single category instead of the Dreadnaught-class and Galactic Republic starship categories
In general, articles on individual objects or individuals should not be included in the same category as articles on groups, but should instead be placed in their own categories. For example, individual astromech droids are placed in Category:Astromech droids, while specific models of astromech are placed in the Category:Astromech droid models tree.
When an article's shared attribute has a corresponding article, such as Category:Humans and Human, the category description should include a link to both the Canon and Legends articles if they exist, preferably through the use of the {{Main}} template. The attribute articles should not be included in the category themselves, but should instead use the {{RelatedCategories}} template to link to it.
In general, an article should only list the most specific categories applicable, and avoid listing both a category and its parent category. For example, Barriss Offee should be listed in Category:Jedi Knights of the Jedi Order, but not in the broader parent category Category:Jedi individuals. This is not a hard and fast rule, however.
The manufacturer category should be applied to the article for the ship's class and the category for ships of that class, but not on the articles for individual ships of that class. If a ship has a defined manufacturer but no defined class, then it should be placed in the manufacturer category directly.
Categories should not intersect between ship type and affiliation; a *Venator*-class Star Destroyer used by the Republic should be listed in the Republic starships category and the Venator-class Star Destroyers category, rather than a "Venator-class Star Destroyers of the Galactic Republic" category
"Unidentified X" categories should be limited to high-level attributes such as starship type - i.e. "Unidentified capital ships" and "Unidentified shuttles", rather than "Unidentified Imperial-class Star Destroyers"
A single ship of a class being captured or stolen by a faction does not qualify the entire class for that faction's affiliation category; only the individual ship
Starship affiliation categories should be titled "Starships of <Faction Name>" or "Starships of the <Faction Name>" unless the affiliation is a culture, in which case the category should be titled "<Denonym> starships". The same goes for starship classes as well. (example: Category:Starships of the Galactic Republic vs. Category:Hapan starships)
Individual non-starship vehicles should be included in Category:Individual vehicles