http://en.wikipedia.org/wiki/Wikipedia:Deletion_review/Log/2007_January_16#A... Yet another deletion discussion where reliable sources are debated. I totally agree that creators of fictional material are not a reliable source for their own notability in 99.9% of the cases, but I also believe that for uncontroversial information like character information creators are a source far more superior than fansites (who speculate) and newspaper articles and interviews (who can misunderstand and misinterpret).
The same applies to blogs. They're generally not reliable, but when it's the blog of a director, it's an excellent source for information about the movie he's shooting.
I think people should spend more time on judging sources depending on what they are supposed to back up rather than blindly apply a single non-discriminant rule.
Mgm