Board Thread:General Discussion/@comment-1069190-20130508035123/@comment-10688548-20130509034755

I'm sure that it's possible for visitors to a site to be automatically presented a certain skin, whether or not it will be allowed is another question.

Uncyclopedia is one of Wikia's fave wikis, 'cause it's so big and popular. As such, it's been permitted to exist in not Oasis, not Monobook, but a third skin, Vector. This is due to its favored position and so that it can better emulate the great Wikipedia (which also uses Vector).

If your wiki is massive enough that it carries a lot of favor with Wikia, you can try a feature request, but it's very unlikely to go through.