One of the greatest things about the cartoon series is that the creators based the fictional powers of “bending” on real life martial arts. Having trained in Aikido for 7 years, anything that realistically portrays martial arts in the media is always a pleasure.
Note that Sifu Kisu was the chief martial arts advisor for Avatar: The Last Airbender tv series.
Northern Shaoling Kung Fu – Firebending
Hung Gar Kung Fu – Earthbending
Bagua Zhang – Airbending
Tai Chi Chuan – Waterbending
…and something extra
Southern Praying Mantis – Toph’s Earthbending (because Toph deserves her own recognition).