If you're looking for short, look no further than Mike...who is under 5 feet.
(four foot eleven and three quarters, thank you very much.)

At his updated pull point, Aang is taller than Katara, who at sixteen is probably not going to grow much more. I'd say she's probably Five foot six? Which would make Aang five foot seven?

Which is nothing compared to the six foot...five he's going to level off at someday.