Avatar Volume 1 by Michael Dante DiMartino

Set in a world where the elements of water, earth, fire, and air are controlled by benders, the story follows a young boy who is the last surviving Airbender and the prophesied Avatar, destined to bring balance to the world. After being discovered frozen in ice for a century, he embarks on a journey with his newfound friends to master all four elements and confront the Fire Nation, which seeks to dominate the world. Along the way, they face various challenges and adversaries, learning valuable lessons about friendship, responsibility, and the true meaning of power.