Arthur Jaeger, a male airbender, is a 17 year old scientist and traveler originating from Republic City. When he turned 15 years old, he ventured into the world of scientific pursuits, having the craving of knowledge and scientific development over bending and spiritualism. However, when he turned 16 years old, he found himself to able to perform airbending, and this lead him to use it for himself over others. He's shown to be a genius in science, to the put he invented the datapad and the Jaeger armour. However, when he visited the Earth Kingdom, he was captured by the Queen and was imprisoned until the arrival of Avatar Korra who helped released him, along with the others.
After being saved, Arthur began to go his separate ways before Korra tried to convince him to come to the Northern Air Temple to train better at his airbending skills. Refusing, he tried to leave, but was soon convinced by Lin Beifong and came with them to the temple.