User blog comment:MassiveSodaDuck/Do you use MonoBook or the regular Wikia appearance?/@comment-68-20120403013915/@comment-26686429-20120403104911

That's a problem with the fact that Uncyclopedia wasn't originally hosted by Wikia, so their user database is separate. In the past, Wikia's merged smaller wikis with their user database, but I can imagine there will be many problems with conflicting usernames (there were many on Guild Wiki and WoWWiki, and Uncyclopedia is much larger than either of those 2) which means that it's probably not an option.