Well, I don't usually watch series but today I'm going to talk about a very interesting series and that I recommend you. This series is Avatar: The Legend of Aang.
The series follows the adventures of the main protagonist Aang and his friends, who must save the world by defeating Fire Lord Ozai and ending the destructive war with the Fire Nation. The four nations of Air, Water, Earth, and Fire live in harmony until the Fire Nation declares war. A century later, the end of the destruction is still not in sight, and an Avatar named Aang discovers that he has the power to control the four elements. He joins forces with Katara, a Waterbender, and his brother, Sokka, to restore balance and harmony to their world.

Really it´s a very good series (I´m not exaggerating), I watched it in 4 days, ergo, I kept awake at nights for watch this series!!