The Chaos Avatar

After the passing of Avatar Aang and the Guardian, it was time for next generation to take their place. Korra, a bender from the North Water Tribe, was born; whereas, a boy was born as the next guardian. What makes him unique are the elements he can bend that no other bender can. Even within is a dark presence that has caused difficulty for the young guardian. This is a secret that he's kept hidden for most of his life and won't hesitate to kill someone to make sure it stays a secret. But how would this change if he and Korra meet? Would it be another fateful clash of light and darkness... Or something else entirely?