avatar the last airbender

There are four nations in the world, Fire, Walter, Earth and Air. Fire nation wanted to dominate the world and they started to invade other kingdoms which caused suffering. the Avatar, whose destiny is to restore the world peace and balance must learn from other 3 masters (He himself knows the air bending already) to defeat the fire Lord. 

Aang, a run-away kid who tried to escape from this destiny of saving the world, finally take the responsibility courageously to balance the world
Zuko, the son of the fire Lord, who used to think of his only purpose in life is to chase Aang, finally comes to his senses and joined Aang’s group to help defeat his father. 
Iroh, Fire Lord’s brother, after experiencing the loss of his son while conquering the earth kingdom, became a philosopher. Most of his time, he is with Zuko, and always ask Zuko the key questions such as “who you are, what do you want”. at the end of day, he redeemed himself by freeing earth kingdom. 

Katara is a water bender, she is brave and kind hearted. she has some healing power. Fire nation people killed her mother and she was filled with anger and unforgiveness. eventually, she forgives. 
Sokka is Katara’s little brother. he is a funny person and he is known for the “idea” person, who is creative and who can plan. He is loved by couple of ladies while the first love becomes the moon. 

Balance and harmony.