Avatar the Last Waterbender?

You all know the story of avatar the last airbender. But what if there was a twist? What if the last airbender was in fact the last water bender? Story plays out as normal but instead of the air nomad genocide, the fire nation attacks and wipes out the water tribes. You awaken inside of an iceberg as normal, but who awakens you and what is your gender and name? Will you be able to master all four elements and save the world before Sozin's Commit returns? You decide.