For me a general reference is **not only about the site that could answer it**, it's about the nature of the question. When the question **is the only subject of an article** (Who is X, What is Y), the answer to the question **is** a single link, that fully, completely and easily answer the question. **We don't want to repeat the content of those universe-specific wikis in this site**, so it should be closed as a general reference.

Questions like "What is the Force in Star Wars?" or "Who is Jean-Luc Picard?" are obvious **and extreme** examples, but I think it could apply to question like http://scifi.stackexchange.com/questions/4830/who-was-sifo-dyas.

**Update :**  
The other argument about those question is about the purpose of the site. This is not a encyclopedia, this is a question and answer site. As I said, questions like "What is the Force in Star Wars?" or "Who is Jean-Luc Picard?" are extreme example, the answer to those hypothetical questions **would be encyclopedic information**. Same thing for "Who was Sifo-Dyas?". 

As Gilles noted in [the chat we had][1] 
> **Davrob60** : The problem with this particular question is that it was possible to answer it with a single cut and paste from that site. that was about nothing to add or remove.   
> **Gilles** : But your answer is not that! [...] That's sort-of explained in the Behind the scenes” section of the Wookieepedia article, but your answer says it much more clearly 

The counter argument of this is that should edit the Wookieepedia article to include my "improvement". I don't think having complementary information in tow place improve anything.  

In fact, nothing guaranty that there won't be article in Wikipedia for any character in the [List of Star Wars characters][2]; and I could create one right now for Sifo-Dyas.


  [1]: http://chat.stackexchange.com/transcript/message/1551003#1551003
  [2]: http://en.wikipedia.org/wiki/List_of_Star_Wars_characters