Avatar is still, until today, the best cartoon I've ever seen. Stunning animation, amazing soundtrack -- who here loves Agni Kai?! -- and great character arcs. Everyone in the main cast got enough time in the spotlight to shine but not too much to overshadow the main plot and focus of the story being Aang's fight to save the world from another Fire Nation destruction. I'm in love with the characters, the world building and the overall 'soul' this series has.