At 16, it is revealed to Sherlock that he is the Avatar... He's not overly shocked, nor thrilled about it, though seeing Mycroft's jealousy almost makes up for it. Hailing from the Northern Water Tribe and havng already mastered water, he's sent abroad to train as custom dictates.
His first two masters are concerned over the fact that their new Avatar seems to be a complete sociopath. Also, he's disdainful in the extreme about their abilities and acts superior, and seems not at all concerned with ethics. John is warned of this before Sherlock comes to Ba Sing Se to master his final element: earth.
John is the Earthbending master. Who the others are is really no big deal to me.
Bonus Points: Any historical Avatar persons or history showing up would be amazing!/ Moriarty is a Firebender, perhaps a rival of Sherlock's!/ Lestrade works as a Detective in Ba Sing Se and is constantly getting into beefs with Dai Li agents (scary shit)./ Journey's into the Spirit World!!!!/Magnussen being the ruler of the Northern Water Tribe.
Sherlock/John or Gen - Avatar: The Last Airbender AU (!not the movie!)
His first two masters are concerned over the fact that their new Avatar seems to be a complete sociopath. Also, he's disdainful in the extreme about their abilities and acts superior, and seems not at all concerned with ethics. John is warned of this before Sherlock comes to Ba Sing Se to master his final element: earth.
John is the Earthbending master. Who the others are is really no big deal to me.
Bonus Points: Any historical Avatar persons or history showing up would be amazing!/ Moriarty is a Firebender, perhaps a rival of Sherlock's!/ Lestrade works as a Detective in Ba Sing Se and is constantly getting into beefs with Dai Li agents (scary shit)./ Journey's into the Spirit World!!!!/Magnussen being the ruler of the Northern Water Tribe.