Probably not worth worrying about but "Unbeatable Squirrel Girl" (which is sitting down in Uncategorized) does have an AO3 canonical as "The Unbeatable Squirrel Girl". I got an error when I tried to nominate tags that turned out to already exist under that, so I changed my fandom to match the one that's already there and it went through fine, but just thought you might want to know.