The legend of Korra: The other Avatar( The dark Revolutionary x Korra)

Y/n was just a regular boy who lived in the water tribe along with his brother but he didn't like how the way he was forced to use his bending to harm others so he ran away.

During his departure from home, he met an evil spirit known as Vaatu. Vaatu has been sealed away for 1000 of years but he had somehow able to split his body into two. Once he had merged with the boy, he was now destined to defeat the current Avatar but what if they finally cross path? Will they be eternal enemy or will Y/n, therefore Vaatu have a change of heart?