Okay, I just realized that no one will really understand the Authors Alliance (not the story, the organization). I'll give you guys a little explanation.
First off, there are millions of stories (universes), like Digimon, Fairy Tail, Sailor Moon, etc. The Authors' Alliance universe is in the center of all these universes. They are the only ones who know of other stories. Some universes have many worlds in them (i.e Kingdom Hearts, Tokyo Mew Mew, etc.), but they're all still in the same universe.
Second, the Authors' Alliance members travel using mirrors (hence the Mirror Room). They can travel to any universe using the mirrors. Not all of the mirrors have been invesigated (one mirror leads to another Mirror Room). They only travel to universes that have been damaged or altered.
Third, only members of the Authors' Alliance are capable of traveling to other universes. They are marked with different colored eyes. The eyes allow them to adjust to the different universes-both in appearance and mindset. They are the only ones that do not damage or alter the universe. There are also other people capable of going to other worlds that are not members of the Authors' Alliance. These people seek to merge the universes into one ultimate one. They have begun their mission by transferring inhabitants from different universes into other ones. The only problem is that different universes have different laws. For example, in the universe of Ouran High School Host Club, there is no magic, in the universe of Code Geass there is a power known as Geass and they are more advanced in technology, but still no magic, in the Full Metal Alchemist universe, they are a little less advanced, but they use alchemy(which could be considered magic) If all of these universes were combined, they would have to adjust themselves and their laws to all match, if they can. Anything could happen. Maybe the universes would be fine, but it could also go the other way. They could also be destroyed.
Fourth, in each story/universe, there is a Talisman. A Talisman is a person in each universe that represents it (in Soul Eater, it's Maka; in Code Geass, Lelouch; in Naruto, it's Naruto-basically the main characters). Talismen are unable to leave their universes. The people who seek to join the worlds want to destroy the Talismen. The Talisman of the Authors' Alliance universe is The Leader.
Fifth, the members of the Authors' Alliance do different things. They can be:
-Researchers (investigating and gathering data on new worlds)
-Contacters (they meet and form relationships with inhabitants of worlds, especially the Talismen)
-Engagers (people who handle the beings who get into universes that are not their own-by either fighting them or helping them return home)
-Guards (people who keep an eye on worlds)
-and a few others
Every member of the Authors' Alliance can do any of these. In fact most of them have to. Every member has a one universe that they must handle (i.e for Key, its the World and Otherworld of BRS).
I apologize for confusing anyone. If you have anymore questions-just ask!