Since Avatar has a heavy Chinese influence, thought this might be a little fun. It's a Chinese Zodiac which contains a twelve year cycle. Many Chinese believe that the year of a person's birth is the primary factor in determining a person's traits, personality, physical and mental attributes, and degree of success and happiness.
To find what your sign is match the year you were born with the animal picture above.
(FYI: BSG is a Dragon, Cabbage Man is an Ox and little Cabbage Man is a Snake)