XenoSaiyan wanted to know more about these AUs, so I'm going to explain these AUs, especially its legend, and why it is the way it is. 

A Perfect AU is a general type of Alternate Universe, where everything goes exactly as it does in the script (anime/manga/games/etc). If one tries to interfere with this world before it's completed, it will become its own world, calling it the Ex-Perfect World. No exceptions have been made aside from the one Perfect Shadowside world, which was interrupted near its end due to the Protagonist-Antagonist Switch World. Other than that, it sticks strictly to its rule; no "impurities" are to interrupt it. 

Why is this so? 

Well, let us go into the story, of what it used to be, and what changed it. 

The Legend of the Perfect AUs

Long, long ago, before the First Reboot happened, when the non-fictional world and fictional world were one, the Perfect AUs were untouched; allowed to follow the story of fate. 

However, as Fate Changers began to rise, some who grew delusional and believed they had the strength to rule the universes around, used their powers to interfere with these AUs. With every twist, every world slowly fell into ruin. 

Due to this, the Perfect AU Fate Changer, whose name remains unknown to this day, decided after a talk with Chaos to make sure these Fate Changers don't get their way anymore, and thus used magic to seal it off from outside interference. As a result, the malicious Fate Changers that had done all this tweaking couldn't touch them. 

The AUs began to heal on their own, but this also brought in a new type of AU; the Ex-Perfect AU.

Time passed, and a new Fate Changer for these worlds was born; Mister Movien. Upon being aware of his role, he began to work hard. 

However, as most people do, he slowly grew obsessed with making the worlds perfect. He brought in people from many different dimensions to play roles if one was gone, and named them Borrowed Actors; people not native to the world. They were planted there before the major events happened, so it wasn't breaking the rules. 

He began to believe in his "directing" skills, and thus worked his way up to become a great director in the Youkai World. Even when he was dragging people who wanted nothing to do with this, he didn't care about their feelings; everything seemed to center on him alone. 

It wasn't until he was stopped by the SRS that he realised his faults, and went to jail to try to be a better person. His sister, Miss Movien, is also in the same predicament, but who knows where she went off to. All that can be hoped for is that she's going to be alright too. 

Thus, the Perfect AUs continued on, but the SRS/TTS will continue to try to preserve the Ex-Perfect AUs. And should a villain try to disturb it, they will fight to keep it that way. 

And that's the story. Thanks for reading.