Alright, just gonna give you some info on what this universe we're gonna be roleplaying in is like. Basically, it's a "multiple dimension" kind of place. There's a central hub place, which is the Atrium (I might name it something different, I'm not sure), and then there are a bunch of different worlds that are connected to it. Not all the denizens of these worlds are aware of the fact that their realm is not the only one there is, however.

EDIT: I may or may not write a different origin story, because I just don't like the way this one came out. It gives you the basic idea, in the meantime.

The Origin Story
In the beginning, there was not nothing, as many of the After Realms would have you believe. In the beginning, there was the Atrium, at the center of which lay the Origin Point. This place was the First Realm, and all around it was a void. No one is sure how long it existed before the After Realms, but many believe that is was just always there, and many are sure it will stay for eternity, no matter what happens to anything else. At one point, the point which is the start of time as far as the Atrium denizens are concerned, there emerged the First Elder from the Origin. And he was given dominion over the Atrium and the Origin itself. Soon after, he drew forth from the Origin the first World Heart. This he placed in the void, and from it sprung the first of the After Realms, and it's denizens. And for a time, it stayed this way. But the First Elder watched, and saw that the people of his After Realm weren't. . .anything.

With no contrast, they were not happy, not sad. Neither good nor evil. It was at this time that he drew forth the Second Elder from the Origin, who he named Pandora. She would be the Elder who would give balance to this After Realm. Balance; which would give the people reason to live. They would appreciate happiness when they knew suffering. Appreciate both light and darkness better when they could know both.

She put these opposing forces into a box which she had crafted herself, with great care, and gave it to a denizen of the After Realm. "Go," she had said. "Give this world what it needs." And so the denizen went forth and opened the box, giving the first After Realm balance. After that, details are few, but it is known that the First Elder went on the make many more After Realms, drawing forth or appointing a protecter and watcher of that world, and Pandora created boxes to give balance to them all.