Prologue
The spirits had watched with sorrow as the war went on and on. Not long and it would be a hundred years of war and no sign of the avatar, or that he would return someday to end it. They decided it would be best to have somebody else grazed with special powers to bring this to an end, or at least to find the avatar.
Soon they found a suiting child. A woman of the southern water tribe was pregnant, a few weeks away from her due day. The woman was worried about her baby, it was pretty inactive. The spirits knew, the baby probably won't make it over the first few weeks, if even so long, considering the rough climate.
The spirits took pity for the poor woman. With the consent of a greater power, often considered a god in some worlds, they gave the baby powers of an angel, making her one even though there were none in her ancestry.
Unfortunately, her powers were somehow recognized even before the little one had a name. Her parents and grandmother together with the rest of the tribe was scared of her and so they took the small bundle out, she was laid into a wooden basket and with tears in their eyes, her family let her out into the sea, knowing she won't make it.
Luckily for the baby she was watched. When she disappeared from the tribe's eyesight another angel came down from the sky and in an instant held the trembling, crying little bundle to his chest. He began rising again when some kind of shark emerged from the sea, almost reaching him. But the animal just had the basket between his teeth, which he let go of when he realized there was no flesh at all.
Days later Hakoda should find the destroyed basket on a fishing trip. His heart tightened, he and his wife had loved this child, no matter what powers it possessed.
What he did not know, the angels raised the child with all the love they could spent as a community. She was thought many things, if it was music or fighting, she was a diligent student. Even though she liked music much more than fighting.
The girl realized early who her real parents were and the angels told her what happened back then. She was not really shocked about it. She thought something like that for some time, not only were there no "real" parents, more a collective that raised her, but too, her name was pretty unfamiliar for water tribe so she suspected the angels had given it to her. She would be known as Mary Rose.
On her sixteenth birthday she was given an assignment. She should go to England, she had been there a few times before, and get a fallen angel that made some trouble, killed some innocents, burned a big city, Angela Blanc. She was also told, she'd might encounter some demons.
On the same day, Katara tried to bring some order into their house at the south pole. After the war they were able to rebuild real houses, not just tents, to live in. It was more comfortable, but smehow hard to keep tidy. She came across a little, pretty destroyed, basket. She wondered greatly about it. Never before she came across it and she couldn't think of a way to use it, at least in this state. So she started to repair it.
Sokka came in and asked what she was doing. After she told him, he too was curious what it had been good for.