Avatar: The Last Airbender (also known as Avatar: The Legend of Aang in several countries) is an American animated television series that currently airs on the Nickelodeon television network. Set in an Asian-influenced world of martial arts and elemental magic, the series follows the adventures of the successor to a long line of Avatars, Aang, and his friends in their quest to save the world from the ruthless Fire Nation. The series is written in the form of a book series, with each episode serving as a "chapter" and each individual season as a "book."
These are shows that I have watched from start to finish (sometimes repeatedly) and just absolutely love! While there are many shows I've rated 4+ and loved, these are the few that hold a special place in my heart!
Please note that these are MY personal favorites, not necessarily ones that I would recommend to anyone and would argue are the best shows ever made. There were many shows that I loved that didn't quite make it into this list because they are just too new (need to see where it goes), would not rewatch (or hasn't been long enough to miss it), or just didn't have that OMG reminiscent feel. A perfect example of a borderline show is Avatar: Legend of Korra. I love Avatar and am a huge supporter of that entire line, but I just couldn't include this followup series because I personally felt like it wasn't as good as Avatar: The Last Airbender.