User blog comment:Mr. Nightingale/Questioning the boundaries/@comment-24667521-20140706045559

I think that if it's your own story than you should be able to add whoever you want without worrying. XD I for one love to add in any CGI human character I can, even if they're not really considered part of the fandom. Just go ahead and have fun. Truth is, the fandom really doesn't have any set "boundries," the only reason they exist on this wiki is so people don't just keep adding irrelevant pages. But for a multi-crossover story of your own, I'd say just go for it and dont worry about a thing. XD That's my two cents.